I was a pretty normal teenage jock. Women, sports, and partying were my priorities. Like nearly everyone I knew, I was generally repulsed by the thought of two men doing anything together sexually. I had certainly never been attracted to men in my life.
In fact, the summer after high school was spent in pursuit of girls. I was lifeguarding and teaching swimming at a private club. Part of the day was spent fielding the advances of Jewish mothers who wanted to make sure their daughters got to play before they started husband hunting - or who wanted to play themselves while their husbands were off making more money. I certainly didn't mind the opportunities, and most of these girls were attractive, and nearly all had great bodies. Some wanted to learn about sex, and some wanted to practice what they knew. I was willing to help them all.
One particularly eventful day began with the typical preparation for the swimmers and sunbathers. It soon took a turn when a particularly attractive mother-daughter pair began competing for my attentions. Their offers became progressively more suggestive and direct, and I was having a hard time deciding just what I might want to do. When mom could take it no longer, she finally offered that she would be willing to share me if her daughter was interested. Not being sure if they were serious, or if I was being set up, I headed for the pump room when my shift on the chair was done.
The pump room was a nice haven for the guards, since it was underground, out of the sun, generally cooler than the deck, and there were no people to watch - or watch out for. Walking in out of the bright sun, my eyes adjusted enough to check the dials on the filters and insure that all was normal. Letting my thoughts roam, I began to imagine both of those attractive females working on me simultaneously. It wasn't long before I had a raging hard-on that wasn't going anywhere soon. I couldn't very well go back up on deck like that, so I pulled my cock out of my trunks and began to work it. Within minutes, thinking of a mother lovingly teaching her daughter new skills on my body, I exploded all over the wall. A few minutes to compose myself, and I was back up on deck.
After closing the pool that day, the head lifeguard came over and asked if I wanted to go for a ride. We had done this once or twice, usually going to get a beer and catching a quick buzz to wind down after the day in the sun. After being out for a few minutes, with thoughts beginning to mellow, he said he had a confession. He had watched me down in the pump room. He was in a far corner making a repair when I had come down earlier. He said he didn't notice me when I came in, because of the noise from the pumps, and didn't say anything once I began playing with myself. He let it die at that, and we finished our beers and headed back to the club to leave for the day.
At the end of a summer of working and getting ready for school, I left for college. After I had been there a while, I invited my lifeguard friend to come visit, since he wanted to get to the mountains and we had spent some time partying on a few occasions after work. He was considerably older than me (I was 18, he was 29), but we had gotten along fairly well for the entire summer. Most of the time we spent together was spent partying. I was planning a big party at school, and needed him to bring some supplies from the city.
He showed up, and his first night visiting we had a lot of people at the party (partying was fast becoming my top priority), including my girlfriend. Throughout the night, I introduced people to him so he would feel more comfortable - and thinking he might get lucky with one of the girls who had come on to me. The night wore on, people gradually left, and I crashed on my bed while the remains of the party continued around me.