How to Use a Vac-U-Lock Strap-On Dildo and Harness

So, you've decided to try strap-on sex. Before you begin, you'll need the right equipment.

You'll need to ensure your harness and dildo are compatible with one another. But what if you fancy trying a larger or smaller attachment? You might find that your new toy doesn't fit your harness.

To solve this problem, Doc Johnson has created an ingenious strap-on system. Vac-U-Lock is the world's first fully interchangeable pleasure system which enables you to enjoy strap-on sex, without worrying about O-rings, flared bases and appendage girths.

_“The Vac-U-lock attachment is brilliant. It doesn't move around like other harnesses, so more freedom to move around and go for it without worrying about things slipping or the harness coming loose.” -_Legs47

All you need to do is check whether the toy is Vac-U-Lock friendly, and you're good to go!

All Vac-U-Lock products are made from durable materials. Chances are once you've bought one, you won't need to buy another for a very, very long time.

Video: How to Use a Strap-On Harness

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

How does it work?

Unlike strap-ons, Vac-U-Lock strap-ons feature a unique plug system. This innovative system securely holds your attachment in place for penetrative fun. By using a plug instead of an O-ring, the harnesses are compatible with a wide range of attachments. No matter the size or girth of the attachment you'd like to use, as long as its Vac-U-lock, it'll fit.

“The Vac-U-Lock range, why did no one tell me about these!! The selection of dildos is huge, so we brought this with the slim dildo and I think it's the most pleasure I've ever had in the bedroom.” - Bigh

Each Vac-U-Lock attachment features a purpose-built hole in the bottom. This hole perfectly fits the plug found on the harness. To attach your chosen toy to the harness, simply push it onto the plug, and voilà! You're ready to roll.

Because you don't have to feed the attachment through an O-ring, you won't need to work out whether the girth is compatible with your harness. This makes shopping for new attachments online even easier. You have the freedom to experiment with different proportions.

How to shop Vac-U-Lock

Doc Johnson makes it even easier to shop for Vac-U-Lock by colour coding all the packaging. Remember to look at the key features for each set to make sure you're happy with the fit of the harness and the size of the attachment.

Complete Set

If you're brand new to Vac-U-Lock, or strap-ons in general, the best thing to buy first is a complete set.

A full set comes with everything you need to get started, including an adjustable harness, Vac-U-Lock plug, dildo attachment and a sample of Vac-U-Powder.

Full sets are packaged in orange boxes marked with the number '1'.

Attachments

Vac-U-Lock attachments are considered any items which anchor to a Vac-U-Lock plug.

Vac-U-Lock attachments are perfectly enjoyable when used on their own, but they perform at their best when paired with a Vac-U-Lock accessory like a harness or suction cup.

Attachments are packaged in purple boxes marked with the number '2'.

Accessories

If you own any Vac-U-Lock attachments, you might like to browse the accessories too.

Vac-U-Lock accessories are an array of plug-in products which transform your attachments into fully functioning sex toys for all sorts of fun. These include harnesses without an attachment.

Accessories are packaged in blue boxes marked with the number '3'.

Choose the perfect attachment

All Vac-U-Lock attachments feature a hole in the bottom, which slots over the top of the Vac-U-Lock plug. It is this combination of plug and hole which makes it truly unique.

“Whilst my wife and I are satisfied just using the harness with an 8" dildo with balls, the harness will accommodate the whole variety of Vac-U-Lock attachments to suit individual preferences.” - Purpleplumhead

Custom strap-on play is easy with Vac-U-Lock. Attachments are available in a range of lengths, girths, materials and styles, so you're bound to find something to suit your style.

Choose from: G-spot attachments, slender, beginner-friendly anal probes, lifelike dildos with balls, and super-sized dongs.

Once you own a Vac-U-Lock harness and plug, any of the Vac-U-Lock attachments will fit. Which means you never have to convert diameters and circumferences again – hooray!

How to fit your attachment into the harness

This part is easy. Slip on the harness and adjust the straps for a comfortable fit, then clip the provided plug into the hole using the built-in poppers.

Add a sprinkle of Vac-U-Lock powder to aid insertion, then press the attachment onto the plug.

How to use a strap-on correctly

There a few things to remember when engaging in strap-on sex.

Firstly, whether you’re penetrating an anus or a vagina, always use lubricant. Remember, if your dildo is made of silicone, don't use a silicone lube – go for water-based instead.

Next, don’t just dive in for full penetration. Take your time. Try experimenting with fingers and smaller toys before you attempt using the full strap-on attachment.

Finally, the key to awesome strap-on sex is communication. The wearer won't be able to feel their new appendage, so the receiver will need to tell their lover what feels good and what doesn't.

If you don’t want to disrupt the mood, why not use a safe word to use if things get too intense?

‘With the use of plenty of your favourite lube, and you will not be disappointed! My boyfriend quivered in pleasure after I used this on him! This definitely is a keeper!’ -Keebry38

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