I love shower sex, I assume because I was so suppressed starting during high school puberty taking gang showers, having to stifle the hardons I'd get, continuing all during the years of my Army career. So that when I finally came out and I did have gay sex in the shower, it became one of my favorite things, still is.
And one of my hottest, but strangest memories: I was living with a BF, when his gay friend from Pittsburgh came to visit with us for a few days. My BF asked me to drive us over to a nearby rural college, lightly used during the summer session. He took us into the older basement locker room of the gym, less popular than the newer one upstairs.
He told me and his visiting friend to strip and have sex under a shower head in the gang shower, while he watched at the entrance and kept guard. His friend & I were a little dubious at first, but it's kinda difficult for a gay man to resist that sorta bait, so strip we did.
It was fantastic! All soapy & slippery, giving each other whole-body standing massages, just reveling in it. I soon got him off, with a combination of oral and manual (we did no anal), but he was having trouble with me. I think the fear of detection was holding me back.
Finally my BF called in: "Bob, imagine you're both Army soldiers. You're back in a barracks when you were a Private, it's nighttime, and you two meet while taking a late shower."
Well, that's all the inspiration I needed. I think I popped in a minute flat.
Back in the locker area when we went to dress, my always-horny BF started getting frisky with us. In a flash we were into a 3-way on the bench between the locker rows, and all 3 of us got off.
So now we're back at his house, and he takes me aside in the kitchen and tells me he has a confession to make. The other guy's a priest!!!
"A PRIEST!!!!" I screamed. "Why the hell didn't you tell me?"
"I was afraid you'd act this way and not wanna do it," was his excuse. "And lower your voice, he'll hear you upstairs."
"I don't care if he hears me in Pittsburgh! You just tricked me into having sex with a priest! I'm going to Hell!"
"No, no! He's cool about it, says it's not a problem."
"Fine for him to say! Maybe I should ask his Bishop!"
Well, we went around & around for a while, but what was done was done. My first gay gym shower sex ended up being with a priest. Isn't life grand?