I'll back up what lament has said 100% - banding about words such as 'incestuous' in a casual way could be taken as offensive by many members of this thread. Incest isn't something to joke about, and it certainly isn't an appropriate adjective to use in regard to any ship.
I would hardly joke about such a thing or bandy the word about as a joke (as I have a good friend who was a victim of this and I saw her through a tough time dealing with it). I'm merely voicing an opinion of why the Grissom/Sara thing bothers me. It's just my view - even though they aren't *actual* father/daughter but there is the overtone (I'm not sure that's the right word....)
My post wasn't meant to offend.
I'll go back to my corner though and shut up on the subject permenantly.