The hadn't know each other for 30 years,since she was 1.,reunited when she was 31...and fucking like rabbits a few weeks later.

I'd give them a pass though. They may as well be strangers. It'd be different if he had raised her or at least been in her life but they don't have any kind of a Father/Daughter bond.
To me that bond/relationship is more important than the DNA aspect. After all,if you adopt and raise a child to adulthood and then begin a sexual relationship,wouldn't that be incest,despite no DNA link?

The genetics only really matter when it comes to having kids,given the increased chance of medical problems(note that a previous infant died shortly after birth).

They're not much different than any other May/December couple....just an increased chance of poppin' out mongoloids.


That being said...there's plenty o' snatch in the world man,find someone that doen't look like you!