How to Choose a Dildo That Fits Your Harness

by Lovehoney

on 3 May 2017

Most strap-on harness kits have either a hole or an O-ring that you slot the dildo into, and usually come with at least one dildo to start you off. Once you discover the joys of strap-on sex though, you'll be hungry to try dildos in new shapes and sizes - or may be be ready to go bigger.

These are customer favourite harness-compatible dildos:

This guide will give you all the information you need to choose the right dildo to fit your strap-on. And remember, with our generous returns policy you can always check your dildo in your harness at home and if it doesn't fit, just send it back.

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Available products featured: Lovehoney Lifelike Lover Realistic Dildo 6 Inch, Sportsheets O-Rings Set of 4

How to Choose a Dildo That Fits Your Harness

Whether you're looking for a shiny new dildo for your harness, or have a favourite dildo you want to use in a harness and aren't sure what size to go for, we can help.

To choose a dildo that will fit in your harness, start by measuring the internal diameter of your O-ring. Make sure you're only measuring the space the dildo will go through, not the full width of the O-ring.

To choose an O-ring or harness that will fit a favourite dildo you'd like to use in a strap-on, measure the circumference of your dildo at the part just above the flared base (where it will sit in the O-ring).


Compatible Dildo Calculator

Our handy calculator does the maths, so you don't have to!

  1. Are you looking for a new dildo?

    If the internal diameter of your O-ring is inches

    You will need a dildo with a circumference of: 3.90 inches (or slightly smaller)

    Browse our Harness Dildos category: all products are suitable to use in strap-on harnesses.

  2. Are you looking for a new harness to fit your dildo?

    If the circumference of your dildo is inches

    You will need an O-ring with a diameter of: 1.25 inches (or slightly larger)

    View our How to Choose a Strap-On Harness guide: all harnesses listed by O-ring diameter.


Lovehoney Universal Strap-On HarnessExample:Let's look at the Lovehoney Universal Strap-On Harness.

On the product page, under the 'Key features' section, you can see that it includes an O-ring with a diameter of 1.25 inches.

So, an example of a compatible dildo is the Tantus Charmer Silicone G-Spot Prostate Dildo.

It has a circumference of 3.9 inches (a perfect match for our harness O-ring size) and it has a flared base meaning that we can just slip it through our O-ring.

How to Put A Dildo In Your Harness

Lovehoney Advanced Unisex Strap-On Harness Kit with 7 Inch G-Spot DildoTake our word for it, it's easiest to get your dildo in place before you put your harness on! If your harness has an interchangeable O-ring, make sure the O-ring is attached to the harness before you start.

If your dildo is long and smooth with a flat, flared base like the Lovehoney 7 Inch Curved Silicone Dildo, you can just slip it into the O-ring.

If your dildo is large, has a big kink in it or has testicles like the Lifelike Lover Realistic Dildo 6 Inch, you’ll need to approach it from the other end. Gently pinch the flared base and work it through the O-ring.

Either way, a little water-based lubricant can help ease the dildo through the O-ring.

Above: Watch Sammi Cole tell you all you need to know about strap-on harnesses.

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Originally published on 3 May 2017. Updated on 5 Aug 2020
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