Kink is an umbrella term used to describe a wide range of sexual interests and behaviors that fall outside of the conventional “vanilla” appetite.

And while kinks were once thought of as fringe sexual interests enjoyed by a small group of people, over time, they have become more and more mainstream.

In the last decade or so, “Kink has permeated our cultural consciousness in a way that it never has before,” sex researcher Justin Lehmiller wrote in a blog post for Psychology Today, citing the popularity of the “Fifty Shades” books and movies as a prime example.

Some kinks are things folks have acted on or might like to act on one day (with clear communication and enthusiastic consent from all parties, of course). But for others, a kink is something they’re happy to enjoy as a titillating fantasy in their mind.

So which kinks are folks most curious about these days? We asked sex experts to reveal what they’re hearing from their clients.