Newton's third law of motion states that for every action, there is an equal and opposite reaction.

And while double-ended sex toys probably didn't play a role in Sir Isaac's extensive research, they are a prime example of classical mechanics in action (bet all this physics talk is getting you hot and bothered, isn't it?)

What many people don't realize is that toys with double penetration features aren't just for couples – they're perfect for solo play too.

Think about it. We've been blessed with multiple erogenous zones, so why not light them all up at the same time?

So whether you're riding solo or bringing in a pocket-sized guest star to your couple's play, here are five top-of-the-range sex toys that can double your fun.

Is there a sex toy in your imagination that you've never seen on the market? If you think you've got a future in sex toy design, we want to hear from you. Enter our design a sex toy competition and make your dream a reality.

Enter here.

In this week's video Sammi and Alix give you some tricks and hints on how to satisfy the judges and give your design the best chance.

Don't forget to subscribe to keep up to date with all our vlogs every week!

Curious about butt plugs? Want to know what they feel like and why people use them? You've come to the right place.

Your butthole is packed with sensitive nerve endings that can feel incredible when stimulated. But how do you get to them when they're tucked away in your butt? Of course, a finger or a willing partner's penis can help you out, but there is another, super-pleasurable option if you're keen for a little butt fun.

Enter the trusty butt plug: an intrepid little toy that's shaped to fit your body and more than happy to help you explore the pleasures that lie beyond your backdoor.

Butt plugs come in different shapes, sizes and materials, so which one's best for you will depend on your experience, anatomy and what kind of sensations you're after.

With the right prep and progression, a butt plug can offer a new, and potentially more intense, way to orgasm.

Read on to find out how...

"I should try a sex toy." It's a thought that's been gently niggling at the back of your mind for a while now.

"You have to find out what the fun is all about!" it says. "Lovehoney wouldn't have an extensive website, a blog and a YouTube channel with over 100,000 subscribers if sex toys weren't all that they were cracked up to be."

You've been scrolling through our website when you get some time alone, trying to work out if you should go for something that vibrates, or sucks, or thrusts or plugs, but there's just too much to choose from!

You know you want to try a sex toy, that much is certain.

Maybe it's because you've never had an orgasm before and you're curious to find out what it's like – I know that's why I bought my first sex toy.

Or maybe you know how to get your rocks off on your own but now you want to take things to the next level. If you're not sure where to start, just think of it as like using your favourite online shopping website.

You can shop according to brand or price. You can read other people's reviews to get a sense of customer satisfaction levels. Sometimes there are sales and discounts, so you can snap up a bargain – all those parts of sex toy shopping are familiar.

But with Lovehoney you can also shop according to what orifice you want stimulated, and whether you'd prefer your dildo to look realistic or not – so I guess that kind of sets sex toy shopping significantly apart from any other retail experience.

Here are 5 beginner toys you should look at if you're not sure where to start.

Nipples are amazing things and, guess what? Everyone's got 'em!

In this week's video, learn how to stimulate your nipples for out-of-this-world pleasure, fast-tracked orgasms and discover the elusive-yet-mind-blowing nipplegasm.

Did we miss a trick? Let us know your thoughts in the comments!

Sex toys are not just for the V. There are so many amazing toys on the market, specifically designed to treat your (or your lover's) meat.

If you're on the hunt for a gift your partner will love, look no further. We've compiled a list of 6 of our best-selling male sex toys. From strokers to butt plugs, we've got them all.

No matter your budget, we've got the perfect toy for your boy.