Tish sex isn't always tied to emotions, certainly isn't for me, more often it was like an itch that needed scratching.

I couldn't be bothered with the hassle of being couple, didn't mean I didn't Want sex.
I didn't want to share emotional baggage, when you get involved in a relationship, people invariably want to know it's going somewhere, that this thing you share means something, I just couldn't be doing with that.

Friends don't want to know where your at 24/7, you don't have to worry about their feelings if you don't want to hang out. They won't instantly think your not interested.
You can go out and have a laugh then not call for week, and when you do call you don't have to explain why you didn't call.
There are no expectations of the relationship going 'somewhere'.
Another annoying thing partners do, if you don't want sex it's 'something they have done.'
No, sometimes I just don't want to, not do I want to sit massaging your ego and reassuring you everything is fine with us. (Eye roll)

And if you do it right when you have had enough, or it just fizzles out. That's it.
No messy break up, no his friends and your friends.

This is just a handful of reasons I opted for FWB when I was younger. Rather than bouncing from one fulfilling relationship to another.

When I got older and my baby father left I didn't want to get involved with another guy and mess my kids heads up, but still occasionally wanted a laugh and some intimacy.y friend totally understood that.
Didn't have to deal with dodgy dating sites, or avoiding introducing my kids into a stranger.

There are any number of reasons it might work for someone, but being upfront and honest from the get go is important.
To avoid unwanted attachments.