I can understand the "it doesn't feel as good" thing but "I don't care if I get AIDs or herpes" just kind of blows my mind. I think he's convinced himself of that due to the other things you mentioned, such as fear of losing an erection. At least I hope that's what is really going on. Still, over all, I think you are right that women are more concerned, perhaps because they have had yeast infections or UTIs and know how unpleasant that can be.