If it hadn't been for communal showers at the universities I attended in the 70s and early 80s, I never would have tried sex with a male. I was frequently cruised and it was one evening when I had gone swimming and my g/f arrived just as I was about to leave that I went out to the pool and told her, "Another guy is showing it hard to me again!" I was so naive, I thought it was all just a visual game, not a signal that they actually wanted physical contact. Her response was "Go ahead and try it!" It took me a second to realize what she meant. "You mean--actually have sex with him?!!" I asked.
I was so tongue-tied when it came to initiating sex with men that this was the only place I could do it, where you didn't have to say a word. There were a couple of times at the nude beach, but I was too worried about being seen there. At the showers, you could just enjoy a nice hot shower, get half-hard, exchange glances and then meet at the exit and walk to whomever's place together. I lived for almost four years in an apartment less than two blocks from the gym, which was very convenient!