Girls get really offended when you tell them they have terrible genes to reproduce.
Hahaha I actually told a woman that once.
She was once of those women that is constantly sick and suffering from allergies. ALL the time! At first I was tolerant but then it became annoying. She couldn't pet animals or anything.
So I said, "I don't think I want to be with someone that has such a weak constitution. I'm surprised your bloodline has survived throughout the ages. I don't want my children to inherit that."
Needless to say she was very offended. It was cruel, but her life seemed dominated by sickness and I put up with it for a long time. lol