How do gay men stop themselves getting erections when in showers and locker rooms with other guys?

First of all your question assumes that if you are gay you want and desire anything that has a cock.The second thing your question assumes is that men, gay or straight, have no self control over their sexual responses.

Just like straight guys there are people that we find attractive and there are people that we do not find attractive or even repulsive, imagine a scale of one to ten if you will .

Generally if I (gay male) see another man in a public shower that I find very attractive I will not stare and ogle until I get an erection.That's just respect of others and common sense. As you may already know there are men out there that are idiots (both gay and straight) and have no respect for other people and cross the line of decency or privacy.

On the other hand if a guy straight or gay has not masturbated, or had sex in weeks, of course a guy will have a more difficult time in controlling an erection.

One last thing to think about- have you ever heard of a nudist colony? There you have a variety of people, most of whom are straight, all naked and the men do not get erections while interacting in public.

Think about your assumptions....