They've worked fine for me, had 4. One fb relationship even went 5 months & ended mutually. I discuss & have rules with fb's. Make sure it is someone I do not know before hand, we build a genuine friendship - eg, get along well, no mutual friends/family & take safety precautions, I always say to them as soon as one person begins to develop feelings its time to end it, no hard feelings. A big no-no for me is cuddling/affection, thats for relationships. It should remain purely sex. They can work, for a certain amount of time, but tread carefully.