I have had a few in my life...not gonna lie...but i havent been able to really get into that kind of arrangement anymore. Maybe it is old age/maturity...but i'm more 'all or nothing' now.
i've always been like this so dub me mature. its funny, i've tried it and every time, i find myself developing feelings for them and no amt of logic will really help all of the time.. i think one who is able to detach themselves like that from the experience is probably more detached from themselves and their emotions than they ever thought possible.
i remember i was casually dating one guy who had a girl friend (according to him an open relationship) though they were never sexual and we were pretty exclusive though after spending a hefty amt of time together, him saying he was going to go see her later that day, helped me to easily call it quits. i never saw or spoke to him again.
i dunno.. maybe i don't have the experience to comment on this because every time that i've found myself in something similar, ive never gone in with the thoughts of, 'oh, it's just a fuck'..
even then, i have a real problem with that because there is no trust. if there is no trust, im completely turned off.. in a fuck buddy scenario, you don't really know the person or what they're capable of or how honest they are.. you may be able to trust them though how much can you trust other people that they may sleep with? some of you have said you have more than one.. it's a possibility and when it comes to something so heavy and serious as that, i can't help to keep my mental health, sanity and sexual credibility intact.. i like to avoid stds.