If you're a girl... or I guess if you're a guy willing to pay for it. If you're a guy looking for a free fuck, generally friends are easier to find. Not every female friend I've turned into a free fuck has cost me the friendship, but I don't regret the times that it did.
Many years ago when one of my closest platonic female friends broke up with her boyfriend she came over to my place to commiserate about it. We ended up fucking like rabbits for about a month. I think it was helping her get it out of her system... then she went back to her boyfriend and confessed that she had been fucking me. He declared I was off limits, and that was the end of our friendship.
But it was some of the best sex in my life, I don't regret it for a second--and I've made lots of new friends since then. I kind of suspect she doesn't regret it either...
