Apparently men with deep voices have more children, says an article from the BBC.

http://news.bbc.co.uk/2/hi/science/nature/7013136.stm

Oddly enough, the scientists didn't mention anything about homosexuality. Let's see here, men with higher pitched voices are generally more likely to be gay than those with lower pitched voices, as the common Western stereotype goes. Furthermore, in Western societies, prior to the current tolerance to open gay relationships, gay men commonly had a fair number of children, however fewer than straight men of course. So it would stand to reason that gay men in a hunter gatherer society would also be subject to the same forces. Gay men aren't going to have as much sex with women because it's icky; less sex = fewer children. There you have it I just woke up and I've outsmarted the scientists.