The idea of father-son incest is really hot, but like others I've never actually fancied my own dad. I'm kinda glad tho, cos if you had a really hot dad it would be so hard to control your feelings as a teenager. Then again, even if my dad was actually hot I'm not sure I'd see it just because he's my dad. If I really wanted to fancy him, surely I would anyway.
Today the majority of people still find incest inherently wrong (for which, in many cases the Christian Church is responsible). That view's ok, because the vast majority of people would never actually commit it anyway (even if they fantasise about it). But it seems to me there is actually no feasible moral objection to consensual, majority-age incest.
An interesting example of culturally enforced father-son incest is the Etoro of (I think) Papua New Guinea. From about the age of 10 until late-teens the boy is expected to suck and swallow his dad's semen - almost daily in some cases - because it is believed to imbue him with masculinity. Sex with women among the Etoro is actually seen as emasculating, so it's kept to a minimum. (Sounds perfect!)