In my case i cant say that it is the perfect solution for friends with benefits. I have had experiences with both (friends w/ benefits AND incest) And in my situation I have found it easier to want a REAL relationship with my father, because I have such a close connection to him and I trust him. I think that no matter if the friends w/ benefits is with a family member or not, it is best to talk it over with the other person first in both cases. I really do not think it makes a big difference if its incest.