first time with a woman. i was 14, and my 15 yo gf came on super strong, and we fucked in my own bed in my own house. all the time i was saying, "are you sure? are you sure," and boy, was she sure. i then had a series of sexually voracious gf's through college, which i think kept me preoccupied so i never really thought about m2m stuff until my best friend at college (rowed varsity crew, i played soccer) came on to me spring term. i declined, since i was living with my current gf. after graduation i was living solo in dc, he came down to row at georgetown, stayed with me, tried again and this time i let it happen. but no fucking. still fireworks. i decided i was gay. we flip fucked about 2 months later. so i was 22.
btw, after 12 months or so with my first guy, it was clear he was into getting as much different dick as possible, which was not my idea of life. so we went separate ways, i tried men and women for the next few years until i met my wife.