I only ask because because I had one ex-girlfriend in college (she was quite young, only 18) who had a real complex about me seeing her from behind ect. because (and it took her a while to tell me this), she was afraid I'd see her anus and it would be a turn off. It was strange, since it looked totally normal but I can understand her perspective since there's such a stigma on that area as "more intimate" than even the vagina (for whatever reason) but most men I know (myself included) find women's anus' realty cute and sexy.
So how do you feel about a guy seeing your anus during sex?: embarrassed? Indifferent? Aroused?