My college roommates and I once asked the assorted male guests in our apartment if they hung to the left or to the right.
Answer (unanimously): left. (We theorized it was because they were all right-handed and so put their keys and whatnot in the right pocket.)
We also asked those who had been on swim teams what they did if they got aroused in their Speedos.
Answer: it was usually too cold for this to be a worry, and, anyway, that’s what judiciously-wrapped towels were for.
You’re welcome.
h/t PZ Myers, Pharyngula