The first time I let a man cum in my mouth was the first time I ever sucked another man's cock. I was 26 at the time. It was in SF at a gay bathhouse. I was bi-curious and had already let a man, a complete stranger, give me a hand job in a straight porno theater when I was 22 (this was in 1976). I knew I liked having my cock touched by a man but I wanted to see what it was like to touch another man's cock, take it into my mouth and find out if I liked sucking cock or not. I was living in LA and was very concerned about someone I knew seeing me so I decided to go to SF and visit a bathhouse there to have my first experience giving a BJ.
It was a weekday morning and I entered the bathhouse, paid my money and was given a towel and a key to a private room. I went to the room, took off my clothes and headed out to explore the bathhouse and hopefully hook up with a suitable man. I went past the shower area and came across the sauna. I decided to go in and found it empty. I sat for a while by myself and after about 15 minutes or so I was pretty hot and sweaty so I decided to go back to the showers and get cleaned up. After I washed I decided to head back to the sauna.
This time the sauna was not empty. There were two men in it. One at the far end of the sauna and one sitting on a bench just inside the door. I decided to sit down next to the man sitting on the bench just inside the door. Out of the corner of my eye I could see that he was touching his cock. The man at the other end of the sauna could see this and decided to leave. I wanted to let the man sitting next to me to know that I was interested in him so I put my hand down to my pubic hair and moved my hand back and forth, careful not to touch my cock. As soon as I did that the man put his hand on my back. That was all the encouragement I needed. I got up from the bench and moved in between his legs. His cock was semi hard and sticking out. I reached out with my left hand and started to gently stroke his cock. It was very large, thick and cut. It felt amazing to actually be touching another man's cock for the first time and feeling his cock get harder and longer in my hand As much as I enjoyed touching his cock I knew I wanted to take him in my mouth so I moved in closer, closed my eyes and took his cock into my mouth. I began to move back and forth on his cock, gently sucking him and paying special attention to the very large head since that was what I enjoyed most when a woman would give me a BJ.. I knew immediately that I could do this, that I didn't hate it and that I actually really liked having him in my mouth. I could feel his cock getting bigger and harder as I sucked him. The idea that someone could come into the sauna and see me giving this man a BJ crossed my mind but I was so into what I was doing I decided I didn't care if someone came into the sauna and saw me sucking this man's cock.
This went on for about five minutes and then the man said we should go to his room. He had become fully erect by then and his cock was about eight or nine inches long and very thick. I said OK and told him I was only interested in giving him a hand job or a blowjob. I wanted him to know I was not at all interested in him fucking me. He said that was fine and off we went to his room.