Actually when i think about it, it's a grand idea. Lets have it in. Yeah, why not.
And now i have some suggestions of myown.
A trait called 'zoophile', or as more popularly known among folk - 'sheep shagger'. Very popular among herders.
Damn, lets have insest back in the game. It's not like it never happened. It would be similar to excommunication trait, only negative prestige hits the hole family, if not the entire dynasty.
And since we don't want to discriminate anyone, lets have 'necrophile' and 'pedophile' in aswell. The first one would clear 'canonised' and 'saint' traits from dead relatives and the latter - let's say you just don't want them near your child and education.
There - some really interesting role play possibilities for you.
I believe there are many more colourful traits out there that could be in the game. If we all would just concentrate and let our imagination fly freely.