Well, I'm coming late to the party here, but I just wanted to note that incest in fics doesn't bother me. In fact, it's probably easier to list what does bother me, which is scat, watersports, and guro.
Beyond those, anything is good, be it incest, lolicon, shotacon, yuri, yaoi, rape, futanari, etc. Of course, how well these're written will make all the difference, but none of these are things I'd avoid out of hand (or would avoid writing myself, if the mood struck me).