I was a young guy just out of the military, just out of Vietnam. I'd been a combat infantryman and came back with ghosts and nightmares in my head. Needless to say I found self medication something that helped out.
After one of my parties, I got so loaded I decided to take a bus back to my small apartment on the other side of Denver. It was late and the buses were only running on the hourly schedule. I waited at a stop for a bus that would take me west after a run through downtown. Only a few minutes had passed while I waited when a guy in a vintage 56' Chevy pulled up to the curb. It was an older guy in his late thirties. I was 19 and had gone to war and back. I'd grown my hair long and was a tall wiry guy at that time. The guy in the car asked if I'd like a ride someplace. I never gave it a thought that late at night and accepted the ride gratefully. I really didn't have a clue what was about to happen.
Never in my wildest dreams had I thought about sex with a man. In fact I'd grown up with a group of homophobic guys that thought going up in the part of town where "fags" hung out to beat the hell out of them was good sport. I never felt that way but was pretty much a homophobe by association. I didn't hate on gays but I didn't know anything about them either.
And so...when the guy driving reached over and placed his right hand on my crotch and gave it a squeeze, it took me by surprise. My first impulse was to kick his ass but the feel of that hand touching my cock through my jeans excited me. He looked over at me and asked if I wanted to play. I didn't know what play meant in much detail but I did surmise he was talking about something sexual.
I couldn't believe I said "sure". But, I had just come from a party where I'd smoked a good many joints with others, had lusted over some of the women, who in those days were mostly bra-less, and come away from the party horny as hell.