Quad4 72,
The gay/guy on your track team sound unusual.
I have only seen a guy hard in the showers once, and that was in 7.th grade.
People tend to get used to the situation, that is, showering with their preferred sex, without showing a reaction.
If you look at nudist beaches a hard-on is out of context as it is not a sexual situation and they rarely appear.
Don't you think almost all gays would be used to naked men in the showers without reacting like a teenager at his first sight of boobs?
(Hint: consider the percentage of gays and frequency of hard-ons in showers)