An interesting subject to show or not to show

I swim at a pool that has communal showers - some guys strip to nothing others keep there trunks, speedos etc on
Recently i was in there with one guy in his shorts, i wear speedos and took them off
he appeared shy and then moved and a little outline suggested he was excited or packing a huge cock, anyway he decided not to take them off
out in the change / drying area he is careful to hide everything with a huge towel and then just prior to putting on his trunks he stood turned toward me and exposed a big cock that looked somewhat excited
the next week i think he bit the bullet and took off the shorts in the shower
since then sometimes he does, sometimes he doesn't

i think it turns him on a bit, not that i mind
one night it was a bit busy in the shower with 3 guys i'm sure were gay and the other not sure and the guy with his shorts, all others naked, suddenly he took them off and a couple of jaws hit the shower floor
the big boy took the advice of those above, not making eye contact and faced the wall but i'm sure was aware that they all looked at him

do you think i'm right that he likes to show it off
don't know if he is gay or straight but he swims with a petite girl and they act more like friends than lovers in the pool
do straight boys with big cocks like to show their stuff?
and would he be offended if i asked for a date?

any thoughts