Well, I think it's pretty simple really. The men who prefer TS's have homosexual tendencies but they just can't come to grips with it. They think they're straight because they don't like masculine men, in fact they like us to be as feminine as possible except for that one little thing. Some of them are very creepy largely because of the closeted nature of their sexuality, but many of them seem very well adjusted.
Oh, one more thing, the majority of men who are interested enough to chat with me online, lose interest rather quickly when they find out that I have no interest in topping them.