Growing up I found that I am equally attracted to both sexes, although more often I find myself fantasizing about men. Maybe because it seemed risque.
When I was 17 I spent the summer at a lake a few hours away from home. While I was there, I met Michael, who was in no way unattractive. While I was fairly stocky (5'9, 250), he was lean and mean at six foot. He had six pack abs that seemed carved out of granite, with the definite V pointing to his groin. We first met at down on the beach, where he was hanging with a few friends. I was alone, because my cousin (whom I went with) was out visiting at a old friend's house.
I watched as Michael came out of the water, dripping wet, with water running over his chest and down into his swimming trunks. He noticed me watching and waved, then came over and asked if I like to go with them on a hike. I said yes, and we hung out for the rest of the day, shared backgrounds, and figured out where each other were staying. I could tell Michael was okay with the attention I was giving him, as he would grin whenever he found my gaze drifting to his cock (which was pretty easily seen in his shorts). Often I would catch him doing the same.
We went hiking often over the next week, each time with more growing sexual tension. At first it was just bumping hands, then grazing hands against groins, and then full blown groping. We figured out a day where my cousins would be away from the cabin and he could get away for a while. We went swimming and then went to take a shower at the cabin.
He wasted no time stripping in front of me, and his cock was only slightly smaller than my own (7' and 8' respectively). I could tell he had a semi hard on, so I stripped down myself and then pressed him against the wall of the shower (very spacious, fancy shower). I rubbed my completely hard dick against his and thrusted slowly at first then harder as he started moaning. He grabbed both of our penises and held them together with his hand at first, then moved both his hands to my ass, which he grabbed onto tight. Pretty soon we were both cumming over each other, which we cleaned up quickly and then washed off.
I still see him occasionally, but now he has a boyfriend of two years and I a boyfriend of one.