I understand were you're coming from. Of course beauty is beauty but in a forum dedicated to Black for White it seemed most appropriate. I could have found a tag for Asians or Native America or Indian women just as easily. Also sexy and beauty aren't mutually exclusive either. The women who have posted are both. I have seen my fair share of unattractive women (not just black ones).
Believe me in a society that stigmatized and stereotyped Black people, especially with America's history, the racial undertones will always exist sadly. Not to mention how black women are viewed with negative connotations. Sure you may see more black men with white women since it is more common with interracial relationships, but you don't see as many white men with black women, although that idea is changing. People now have the ability to explore other ethic groups because people are becoming more accepting.
Just think there would be no black men without black women. The post is just for enjoyment and entertainment. Didn't mean for it to get too deep. Good on your wife too.