Even tho it's cooler to wear boxers, Boxers are actually not very good for you. Not only do they not support the butt region, they also do not regulate the temp for the family jewels, so it's bad for making little billy bob junior.
Uhhh... noooo? Regulating temperature is exactly the reason that a man's jewels are located outside the body instead of inside. Your body performs that function naturally; you don't need your clothes to do it. (*Hint* You're familiar with "shrinkage"; this is the body's mechanism to deal with "the boys" being too cold.) The issue is heat, not cold. Even in boxers, they're still going to be very close to your thighs and will receive the ambient heat coming off of your body. In fact, one of the most common methods to raise sperm count is to lower your temperature by doing stuff like icing them down and taking cold showers - much colder than hanging free in boxers.
Also keep in mind that after you wear your clothes for a while, their temperature will not be that much lower than your own body temp, so even in boxers I don't see the threat of your sperm freezing because they're free in boxers. I'm by no means a doctor, but if you're at the point where the temperature outside of your core is getting too low, you're probably more concerned with surviving than what may come after.
Can't comment on the posterior remark though, I'd never heard that at all.
This post has been edited by wrexness: 29 June 2010 - 08:28 PM