Most FWB couples end up staying friends in the long run, even long after their sexual relationship ends. [2] X Trustworthy Source PubMed Central Journal archive from the U. S. National Institutes of Health Go to source

Your brain actually produces a hormone known as oxytocin when you’re attracted to and physically intimate with someone, and it makes you feel attached to that person. [3] X Research source

Most FWB relationships actually end because someone becomes interested in pursuing a non-FWB relationship with a new partner. It seems that an FWB fling is more likely to end than turn into something more serious. [5] X Research source

Friends with benefits relationships can be complicated, and different people experience these arrangements in their own unique ways. If a guy says he’s not catching feelings, your best bet is to believe him. You might think sleeping with another friend will ruin your friendship. While that’s certainly possible, there isn’t a ton of good evidence that this happens all that often. [7] X Research source

If he asks a ton of questions about what you’re doing in your spare time or who you’re hanging out with, it’s a good sign that he’s got a little bit of jealousy. If a guy doesn’t seem particularly bothered when you bring up seeing other guys, he may not be romantically interested in you.

If he only hits you up when he wants to hook up, it’s very unlikely he’s interested in a serious relationship.

If you feel like he’s keeping you at an arm’s length and he refuses to bring you around his friends, he may just want to stay FWB.

If he just talks to you like you’re “one of the guys,” it probably means that doesn’t think of you in a romantic way.

Pay attention to what kind of events he invites you to. If there are any intimate nights out together, or he wants you to be his date to the prom, he’s probably into you.

If you’re going to have a healthy FWB relationship, set clear boundaries before you start anything and communicate openly about what is or is not acceptable.

If you’re thinking about starting a casual fling with someone but you’re hesitant because you’re not sure if it’s right for you, don’t force it. Entering an FWB arrangement requires openness, confidence in the decision, and self-assurance.