How to Put On a Strap-On Dildo

In this guide, we’ll walk you through exactly how to put on a strap-on dildo, break down the different types of harnesses, talk about toy compatibility, and throw in a few tips on maximizing pleasure for both partners. Let's go.

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What Is a Strap-On Dildo, Anyway?

A strap-on dildo is a sex toy that one person wears—typically around the hips or waist—to penetrate a partner. While many people associate strap-ons with lesbian couples or pegging, they’re for everyone. Cis men, cis women, non-binary folks—anyone can use one.

There are a few different ways to wear a strap-on:

  • Harness-based: The most classic and adjustable version, where the dildo is attached to a harness that straps around your waist and thighs.

  • Strap-on underwear: Looks like regular briefs or panties but with a built-in place to attach a dildo.

  • Bulb-held: A design that includes a bulb or plug that goes inside the wearer’s vagina for support.

For this guide, we’re focusing on harness-style strap-ons, since they offer the most flexibility and are a great place to start.

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Step 1: Choose the Right Harness

All harnesses are not created equal, so picking one that fits your body comfortably is key. Most harnesses are adjustable and can fit a wide range of sizes—some from 28 inches up to 65 inches in waist circumference.

They usually have adjustable straps similar to backpack straps, making it easy to get a snug but comfy fit. The more secure the harness, the more control you'll have during use.

There are two main types of strap-on harnesses:

  • Strap-style: Usually made from nylon or leather, with adjustable buckles or velcro.

  • Panty-style: These resemble underwear, offering a more natural fit and feel, though they might not be as firm.

 

Step 2: Understand the O-Ring

The O-ring is the circular piece at the front of the harness that holds the dildo in place. It’s called an "O-ring" because—well—it’s a literal ring. Most are made from stretchy rubber or silicone and come in different sizes to match different dildo diameters.

Some harnesses have fixed O-rings, but many let you switch them out depending on the size of the toy. If you’re someone who likes to switch things up, go for a harness with interchangeable O-rings.

Pro tip: Make sure the base of your dildo is wider than the O-ring. That’s what keeps it from sliding through during use.

 

Step 3: Pick the Right Dildo

Pretty much any dildo with a flared base will work with a harness. Here are your best bets:

  • Suction cup dildos: The base sticks out nicely and stays put.

  • Realistic dildos with balls: The balls keep it secure behind the O-ring.

  • Flared-base dildos: Designed specifically for harness use.

Double-check the diameter of the dildo against your O-ring size. If you only know the circumference, divide that by 3.14 (pi) to get the diameter. For example, a 5-inch circumference dildo has a diameter of about 1.6 inches.

 

Step 4: Putting It On

Alright, now let’s get to the part everyone wants to know—how do you actually put on a strap-on dildo?

  1. Step into the harness: Like a pair of pants, step into the leg straps and pull the waistband up around your hips.

  2. Adjust the straps: Use the sliders or buckles to tighten the waist and leg straps until everything feels secure but not cutting off circulation.

  3. Insert the dildo: Push the dildo through the O-ring from behind (tip facing out, obviously). Make sure the base is snug against the harness.

  4. Check for wiggle: If the dildo feels too loose, try a smaller O-ring. If it doesn’t fit through at all, go for a bigger one.

Move around a little. Thrust your hips forward. If everything feels solid, you’re good to go.

 

Step 4: Putting It On

Alright, now let’s get to the part everyone wants to know—how do you actually put on a strap-on dildo?

  1. Step into the harness: Like a pair of pants, step into the leg straps and pull the waistband up around your hips.

  2. Adjust the straps: Use the sliders or buckles to tighten the waist and leg straps until everything feels secure but not cutting off circulation.

  3. Insert the dildo: Push the dildo through the O-ring from behind (tip facing out, obviously). Make sure the base is snug against the harness.

  4. Check for wiggle: If the dildo feels too loose, try a smaller O-ring. If it doesn’t fit through at all, go for a bigger one.

Move around a little. Thrust your hips forward. If everything feels solid, you’re good to go.

 

 

Step 6: Why Guys Might Use Strap-Ons Too

Strap-ons aren’t just for people without penises. There are hollow dildos out there that guys can wear over their own penis. Why would they do that?

  • Erectile dysfunction: If a guy has trouble getting or keeping an erection, a strap-on lets him stay in the game.

  • Size play: Some people enjoy the fantasy or experience of using a longer or thicker dildo than their natural size.

  • Extended sessions: Dildos don’t go soft, so the session can last longer than nature might allow.

It’s also a way to explore dominance, submission, or role reversal in a relationship.

 

Step 7: Toy Swapping Made Easy

If you think you’ll want to switch up toys regularly, consider a Vac-U-Lock system. These use a special plug that clicks into any compatible toy from brands like Doc Johnson. It’s faster than dealing with O-rings and works well for girthier dildos.

You can go from a slim 6-incher to a massive toy like "The Hulk" (yes, that’s a real name) in seconds. Just plug and play.

 

Final Thoughts

Putting on a strap-on dildo doesn’t have to be complicated. Once you understand the parts—harness, O-ring, dildo—you can customize your setup to match your body and your preferences. Start small, communicate with your partner, and don’t forget to laugh if something goes sideways. It’s all part of the fun.

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