This article is from the Internet Personals: Advice for Gay Men FAQ, by Fred Young firstname.lastname@example.org and Dean Esmay email@example.com with numerous contributions by others.
This comes up periodically. Frankly, it strikes me as a fine idea.
However, some people are against it, some sites would not carry
groups for "members of the same sex" (motss), leaving them with
nowhere to post.
On the other hand, with the high traffic and multiple cross posts
we see in the alt.personals.* groups, it makes lots of sense to
separate the categories.
Ultimately I'm not sure exactly where I stand, but if you're
really interested in seeing something like this happen, write up a
proposal and bring it to the alt.config newsgroup for discussion.
Arguing about it anywhere else is pointless.