I've never been in the situation of having a f*ck buddy or needing one but I know that I would never go to that route because sex, to me, is an extremely personal and spritual thing. I wouldn't be doing it with someone that I didn't intend to have a long-term relationship with. Once sex is involved, the relationship goes to a personal level where someone could get hurt.
Sportsdude, I know that you probably don't want to hear this, but I'm sure that the time will come. Change can just take a while.