There appears to be a correlation between being gay and having slutty siblings, according to new research. The more sexual partners a person had, the more likely to have a gay sibling. The numbers guy in me then wonders if the problem is not frequency, but how vocal they are - people who view sex as less vital to their life will have fewer partners but also be more likely to still be closeted. Any which way, if you've got a gay friend, make sure they have a hot sister - it'll pay off, because the science says so.