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First time buyer's guide to in-body vibrators

Written by: Bestvibe Published on February 25,2025

Preface

Recently, at a friend's party, a friend asked me for the first time how to choose the size of an internal vibrator.

As a person who has been there, today we are going to talk to you about this topic from the bottom of our hearts, especially for sisters who are afraid of pain and injury, this guide can help you save a lot of money.

Vibrator selection range: 18-22mm

For girls who are completely sexually inexperienced, remembering this range is as important as remembering your shoe size.

A size below 18mm can be replaced by a finger (we will teach you the correct way to practice with your fingers later), while a vibrator above 22mm is equivalent to forcing two fingers together, and the level of pain can definitely make newbies doubt their lives.

Here is the key point: when looking at the product parameters, you need to focus on the 'top diameter', not the centre or root size!

Just like buying a pencil, you should look at the thickness of the tip, not the thickness of the handle, and only the first 1/3 of the vibrator actually enters the body.

Some products are labelled 22mm, but the head is bullet-shaped, which may actually make the experience friendlier than a rounded-head model vibrator labelled 18mm.

Why can't you skip levels when choosing a vibrator?

Many girls don't understand why masturbation should start with finger practice.

In fact, our bodies are like a yoga practice that requires gradual stretching.,The average stretch limit of the vaginal lips (hymen) is 25mm, but just as a rubber band can snap if it's suddenly stretched to its limit, jumping straight to a large vibrator is likely to cause irreversible damage to the vagina.

According to the UK sexual healthcharity 2023:

  • 73% women who use a vibrator for the first time fail because they choose the wrong size;
  • With proper training, 91 per cent of users can adapt to a 22mm product within three months;
  • 82% of medical interventions involve injury due to lack of lubrication or forced penetration;

The scientific training method is as follows

  • Week 1: single finger practice (approx. 15mm)
  • Week 2: both fingers together (approx. 20mm)
  • Week 3: Fingers can be separated naturally (about 22mm)

Remember to trim your nails and use lubricant before each exercise. When you can easily close three fingers together (about 25mm), congratulations on unlocking the ability to safely use a full-sized vibrator!  

Finger training is recommended 1-2 times a week, and remember that the quality of your sexual experience does not depend on the size of the device, but on a gradual process of exploration and respect for your own body.

Designs that hurt when you look at them

Vibrators on the market come in all sorts of shapes and sizes, but beginners should avoid these: spirals, rectangular bulges and bulbous heads;

It is recommended to choose the "teardrop" or "streamline" design, the head diameter is smaller than the centre of the 3mm or more of the most friendly style.

Material: Silicone > TPE material > ordinary plastic.

What happens if you force a vibrator in?

I saw a news story last week: a 22-year-old girl bought a 28mm Netflix model vibrator online, which not only caused a ring tear of the vaginal flap, but also caused abrasions on the vaginal wall.

Most painful of all, she thought the bleeding was normal and hardened herself against the pain for 3 days before seeking medical attention and finally having a clean stitch.

So beginners should never be hard!

How should I upgrade and replace my vibrator?

Once you are comfortable with the 22mm base model, you can increase the size by 2-3mm every 2 weeks for adaptive training.

We recommend the "sandwich training" method: cover the original vibrator with a food-grade silicone sleeve and increase the diameter of each layer by about 1mm.

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This method is gentler than replacing the larger size, and can be adjusted according to your daily state.

Finally, I would like to say that body exploration should be a beautiful experience, there is no need to force yourself to satisfy the psychology of curiosity or the psychology of comparison.

-End-

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