I posted this story on another thread.
I was about 26-27 when, at a gay club, I met a tall, skinny bi-guy who was seperated from his wife. He was visiting from out of town and staying with relatives, so we just exchanged #s and kept in touch. About a month later I traveled 500 miles to his condo in Fitchburg, Mass. Within about 30 minutes of arriving there, our clothes were off and he cranked up 10 inches! Damn, I was shocked. I had no idea he was packing that. It wasn't thick, just long and veiny. Best memory: As he was fucking me doggie-style, I suddenly exploded without even jerking on my dick! That 10-incher hit something and I popped. That was the first and ONLY time that ever happened to me.
It was definitely an intense, euphoric orgasm! I wish I could experience it again, but I cannot recall the specific move that triggered the orgasm. Also, I'm be curious to know if someone has experienced it while getting screwed by an average size penis, or is it only possible with a 10-incher? No use in trying it without the right equipment, and I don't like using dildoes or other toys.