Ask HN: Online Discussion Site with Balanced Percentages of Males and Females?

I saw an interesting comment in another thread about online sites that help "match up" people for intellectual conversation, with the clear implication of "match up" being "find a date." That got me thinking that most online communities I join for intellectual discussion are either very predominantly male (my guess about Hacker News) or very predominantly female (the typical case for most online communities about homeschooling, where I spend a lot of my time as a member of a tiny male minority). The one online community I know with a good balance of men and women and sometimes very intellectual discussion

http://talk.collegeconfidential.com/parents-forum/

is explicitly for parents, and thus probably doesn't include a lot of single people of either sex. So offhand I can't think of many places to go online for intelligent discussion with smart, young people who may be heterosexual and who are looking for a date with someone of the opposite sex. How about you? What sites do you recommend for that?

See the thread from pg, "Startup Ideas We'd Like to Fund"

http://news.ycombinator.com/item?id=250704

based on his announcement

http://ycombinator.com/ideas.html

for background on this in discussion of item 8.

for more bac