I don't see it as a sexual thing for me; more emotional. The times that I've gotten aroused while regressing used to freak me out for years, but fairly recently I learned that it's actually perfectly normal for a two year old to get erections and even masturbate; I was a bit shocked to discover that, but also immensely relieved because as a little kid I was terrified I was some kind of pervert which was the biggest reason I was never able to talk about it with my parents.