I'm sorry but you must know some messed up people. I don't see the point of either. I guess this might be some sort of cultural dissonance since I can't imagine such a response from anyone.
And again what would the emails have to do with it unless you are in the habit of letting other people view your emails.
Maybe the people you associate with might find it repugnant but it really is far too strong a term to use as a generalisation, most people I know couldn't care less, they might not want to do it themselves but they are unlikely to judge anyone else for it. I know, they are people I know so they must be weird right? Well yeah, but why would I want to have a relationship with someone I couldn't be friends with? That just seems....bonkers?