3Fun works to match you with people you would have the most in common with. The more detailed you are with your profile, the better the recommendations will be. This works especially when it comes to matching you with people who share the same kinks and sexual preferences.
As soon as you finish registering on 3Fun, the site provides you with tons of recommended profiles based on your match preferences. Take note that in order to Like or Pass on these recommended profiles, you have to upload public or a private photo.
If you like someone and they happen to "Like" you back as well, you get a match. You can find more information about your match here: Bottom navigation bar > Prospects > Matches.
You can also choose to upload a private photo instead, should you want to keep your online activity discreet, and get your profile verified. On this site, uploading photos are an integral part of accessing the site's contacting features.