I find a man with a vasectomy unattractive. I feel they are less masculine. This is merely my opinion...keep in mind...but I think it would make them less discriminating on who they choose to sleep with. I see them as possibly having herpes or a man that could pass on an infection. If you have sex with a woman and you know she could possibly be the mother of your child and forever linked to you, I think you would make better decisions. If there is no chance of pregnancy I think they probably lower the bar...which makes them dangerous for a woman to be with. No responsibility...probably less likely to use a condom...everything about it is negative to me.