I often hear women say something like "Why are so many hot guys gay?" but a lot of gay guys seem to have feminine features and effeminate traits. Just the same as ANY male creature can sniff out a female among a group of men, tell the sex of a person based on physical traits.  These are like evolutionary tactics for survival. I've kinda pondered another thing where in I wonder if straight, gay, bisexual or w.e have different rates of negative recessive genes.