I haven't experienced this personally, but it would sure bother me if I did. I guess I would feel that I am not my past, whether you want to put a negative or a positive spin on it. I'm the same person, whether you know this about me or not.

The gender differences perspective is interesting to think about. I've told a total of 4 partners, 2 male and 2 female, about my history. Only one of my women partners had a negative reaction, and hers wasn't that negative. She thought I should be "over it" or at least not talk about it at all. But she was boring, and I broke up with her for other reasons (but not by email).