friend with benefits.

I just want to give my opinion on friends with benefits as my mate is currently in this situation and I want to know everyone else’s thoughts or stories, I personally don’t think it works I always find one ends up falling for the other one always gets hurts you never remain friend friends after or you talk about and hook up and that’s the only time I was friends with benefits with someone before my current boyfriend and I ended falling very hard for him and he did surprising fall for me but in my head I knew it weren’t going to work and it didn’t we slept together only 3/4 times it didn’t last for long but I remember the last time I saw him he called me after a year and wanted to watch tv in his new place I went there watched the film and all his expected was sex and I declined and we didn’t speak still haven’t.. my friend has told me to guy she sleeping with has really fallen for her and she not interested, only wants sex and I have told her in my opinion I think she should stop because his just going to get hurt but he’ll keep doing it just to stay close to her and his also my good mates and his such a sensitive guy and I can see him getting really hurt... What everyone else friends with benefits stories??