Well, I was being a bit more delicate. For most people it's just about nice young men enjoying the company of other nice young men in a Christian environment. I doubt all those people at wedding receptions are thinking about the details of gay sex while flailing their arms about to form the letters. And actually, I wonder if sex at YMCAs was ever very common. That's what gay bars and glory holes are for.
Back when I was single in the late 70's, I used to go to gay bars with my friends. They would pick up other young men and I would chat up their lady friends. The ladies liked the gay clubs to dance, but many were left fairly starved for intimate companionship. Which I supplied.