Originally posted by pr0nstar
Everyone is going to answer differently.
Especially the Lyst's of the board 
pr0nstar
You spelled that wrong.
My beloved and I have had threesomes with both friends and strangers. Each has they're appeal: with strangers youget that thrill of anonymity and spontenaity. Ok, well, there was spontenaity in our stranger case cause we had 'picked her up' so we didn't know this was going to happen: you wouldn't have that it you met your stranger thorugh a website for the express purpose of sexing, but the sleeping-with-a-stranger appeal is strong.
However, with friends there's a certain comfortability level that allows for the really good kind of sex where you don't worry about the sound of your queef/how they like your body/etc. It also allows for future return engagements, like I'm having this.... I'll rein back the TMI right here.
Having a comfy occasional fuckbuddy threesome relationship with a mutual friend is turning out to be a very rewarding experience for me. I think we're all very careful to only do this every couple of months, though we hang out with other mutual friends often, as we don't want it to turn into a threesome relationship, and of course you never want any sex to get routine. Threesome sex, being that extra level of specialness, can be had that extra level less often.