Picking a first butt plug is mostly a sizing question, and product listings don't always make it easy: some give a length and nothing else, and some give no numbers at all. This article explains which measurements matter, how to choose a first size, and what to look for in the design so the plug is safe to use. If you're new to anal play altogether, our guide on how to relax for anal covers the preparation side, and we won't repeat it here.
We use our own set, Trio, as the example, because it comes in three sizes and we can give you every measurement. The same way of reading sizes works for any plug.
In this article
- The measurements that matter
- Choosing a first size
- Trio's three sizes, measured
- Why the base matters
- Lube, and going slowly
- When to move up a size
- Cleaning between uses
- When to stop and see a doctor
- Frequently asked questions
The measurements that matter
A plug has four numbers worth knowing, and they don't matter equally.
Width at the widest point. This is the one to look at first. It's the part that has to pass through the opening, so it decides how a plug feels going in far more than the length does. Width is sometimes listed as a diameter.
Length or height. This is how far the plug reaches. For a first plug, shorter is usually more comfortable, but width still matters more.
The base. This is the flat or flared part that stays outside the body. It needs to be clearly wider than the widest part of the plug.
Weight. Heavier plugs feel more present and can shift more as you move. A light plug is easier to forget about, which is often what a beginner wants.
Most plugs also have a narrower neck between the widest part and the base. That's where the muscles close around the plug once it's in, and it's what lets it sit comfortably instead of pushing back out.
Choosing a first size
Start with the smallest plug you can find that still has a proper base. It may look too small, and that's the right place to begin, because the first goal is to learn how your body responds. Cleveland Clinic's advice for anyone using toys is to avoid ridges or toys that are large in size, so a smooth, small, tapered first plug is the safer choice.
Nerves make a difference too. The same Cleveland Clinic article notes that when you're anxious, the anus can tighten and make it hard to insert anything, so a plug that feels easy on a relaxed day can feel impossible on a tense one. A small first size gives you room for that. If it goes in easily, you've learned something useful, and moving up later is simple.
A set with graduated sizes takes the guesswork out of the second step. Instead of buying a single plug and hoping the next one you order is the right jump, you have the next size ready when you want it.
Trio's three sizes, measured
Trio is a set of three plugs in medical-grade silicone, each with a tapered tip, a flexible neck and a flared base that also works as a suction cup. Here are the measurements from the product page, with inches added for US readers.
| Size | Height | Width | Base | Weight |
|---|---|---|---|---|
| Small | 113 mm (4.4 in) | 28.5 mm (1.1 in) | 45.5 mm (1.8 in) | 48 g |
| Medium | 126 mm (5.0 in) | 31.5 mm (1.2 in) | 52.5 mm (2.1 in) | 67 g |
| Large | 152 mm (6.0 in) | 41 mm (1.6 in) | 62.5 mm (2.5 in) | 127 g |
A few things stand out when you read the table. The step from small to medium is gentle: 3 mm more width and 19 g more weight. The step from medium to large is the big one, with almost 10 mm more width and nearly twice the weight. Many people stay with the small and medium for a long time before the large makes sense, and some never need it.
The bases grow with the plugs, so each one stays clearly wider than its own widest point.
One buyer summed up where most people are when they order: "I'm still experimenting and getting into plugs but these are a great place to start!" (H.B., verified buyer, January 2024).
Why the base matters
The single most important safety feature on any plug is a base that can't go inside. The anus is surrounded by ring-like muscles called sphincters, and Cleveland Clinic explains that the inner one works on its own, outside your control. Because that inner muscle isn't under your control, an object that slips fully inside can be hard to get back out.
The Merck Manual lists objects used for sexual stimulation among the things that can become stuck in the rectum, and removing them can need a doctor and sometimes surgery. A flared base is what keeps a plug where it belongs.
So the rule is simple: anything that goes in the anus needs a base that's clearly wider than the rest of the toy. Never use an object that wasn't made for it, however smooth it looks. Cleveland Clinic adds one more point: keep the base itself outside, because pushing it in can tear the opening.
Lube, and going slowly
Use plenty of lube. Cleveland Clinic is direct about it: your anus doesn't create its own lubricant, and without it the delicate tissue inside can tear. Put lube on the plug and around the opening, and add more whenever you need it.
Choose a water-based lube for silicone. Trio is to be used with water-based lubricant only, because silicone lube isn't meant for silicone toys. If you use our Honey lubricant, the aloe version is water-based and works with every toy material.
Go slowly. Press the tip gently against the opening and let the muscles relax around it before going further. Breathing out slowly helps. If you meet resistance, wait rather than push. Cleveland Clinic's advice is to start gradually and move up to what you're comfortable with, and to stop if pain increases or stays.
Skip numbing creams. Pain is how your body tells you to slow down or stop. Cleveland Clinic's drug guide for topical lidocaine tells users to be careful to avoid injury while the area is numb and you're not aware of pain, which is exactly the problem with numbing before anal play.
Our longer guide on preparing for anal safely covers hygiene and preparation if you want more detail.
When to move up a size
Move up when your current size goes in easily, feels comfortable once it's in, and comes out without discomfort. Give it several sessions first. A size that worked once on a relaxed evening hasn't really been tested yet.
When you try the next size, go back to the beginning: lots of lube, a slow start, and permission to stop. Going back down a size on a tense day is part of it.
Trio as soft dilators
The plugs in Trio can also be used vaginally as soft dilators. Dilators are graduated inserts used to stretch tissue gently over time, and Cleveland Clinic describes starting with the smallest size and working up, never rushing through sizes or forcing a larger one. It also advises speaking with a healthcare provider before using one. If a clinician has suggested dilator work for you, ask whether a plug set suits the plan.
Keep separate plugs for anal and vaginal use, or wash a plug thoroughly before it goes anywhere other than the anus.
Cleaning between uses
Medical-grade silicone is non-porous, so a plug can be washed clean before and after each use. Cleveland Clinic advises cleaning toys between uses and before using them anywhere other than the anus. Our guide on how to clean sex toys goes through the method step by step. Let each plug dry completely before you store it.
When to stop and see a doctor
A plug should never hurt. Cleveland Clinic says that a sharp, intense, shooting pain means you should stop immediately, and that if it hasn't gone within 30 minutes, you should go to the emergency room. The same article says small spots of blood can happen, especially the first time, but heavy bleeding, or blood an hour or more later, is a reason to see your doctor.
See a doctor too if pain continues after you stop, or if you have a condition affecting the anus or rectum and you're not sure plugs are a good idea.
If anything ever goes in and you can't get it out, get medical help right away rather than waiting. A plug with a proper base shouldn't let that happen, which is the whole point of choosing one.
If you've had recent surgery in the area, ask your doctor before using any insert.
Trio is $65 CAD ($49 USD) for all three sizes, and it's also sold with Honey as a set for $90 CAD ($67 USD), which reaches free shipping in Canada. If you'd like to compare a plug that adds weight instead of size, our article on how a weighted plug works explains the difference. Every measurement is on the Trio product page.
Frequently asked questions
What size butt plug should a beginner start with?
The smallest one you can find with a proper flared base. Look at the width first, because that's what has to pass through the opening. Trio's small plug is 28.5 mm (1.1 in) wide and 113 mm (4.4 in) tall, with a 45.5 mm base. Starting small lets you learn how your body responds before you move up.
Why does a butt plug need a flared base?
Because an object without a base can slip fully inside and get stuck, and the inner muscle around the anus isn't under your control. The Merck Manual lists objects used for sexual stimulation among the things that can get stuck in the rectum. A base clearly wider than the plug keeps it outside, where you can reach it.
What lube should I use with a silicone plug?
A water-based lubricant, and plenty of it. The anus doesn't make its own lubricant, and silicone lube isn't meant for silicone toys. Trio is to be used with water-based lube only. Put it on the plug and around the opening, and add more whenever things feel less slippery.
Does a butt plug hurt the first time?
It shouldn't. The first time is usually the least comfortable, but pain that increases or doesn't fade means stop. Go slowly with a small size and plenty of lube, and let the muscles relax before going further. If pain continues after you stop, see a doctor.
How do I know when to go up a size?
When your current size goes in easily, feels comfortable once it's in, and comes out without discomfort, over several sessions. Then try the next size with the same slow start. In Trio, the small-to-medium step is gentle, and the jump to large is much bigger.
How do I clean a butt plug?
Wash it before and after each use, and let it dry completely before storing it. Silicone is non-porous, so it cleans well. Keep separate plugs for anal and vaginal use, or wash a plug thoroughly before using it anywhere other than the anus.
Sources
- Lube, going slowly, keeping the base outside and cleaning toys: Cleveland Clinic, Is anal sex safe
- Objects used for sexual stimulation can become stuck in the rectum: Merck Manual, Foreign objects in the rectum
- The anal sphincters, and the inner one working involuntarily: Cleveland Clinic, Anus
- Avoiding injury while an area is numb: Cleveland Clinic, Lidocaine topical pad
- Graduated dilators and speaking with a provider first: Cleveland Clinic, Vaginal dilators
About this article
Written by the Peach & Cream team, based in Montréal. Published October 15, 2026. Last updated October 15, 2026. Measurements and product facts come from the Trio product page; the buyer quote is exact, from a verified review on our store. This article is general information, not medical advice. Trio does not treat or prevent any condition.