I remember when I was a kid with a collection of straight porn - I read a Hustler (early 80s?) that had an article about man on man sex. The article said that fucking women was great and couldn't be beat, but for raw, sweaty, dirty sex - you had to experience it with another man.
I strated in 8th grade (blowing a friend) but quickly started to get good looking girls. I didn't lick another penis until high school, then again in college. All the while, I had some awesome girlfriends with absolutely filthy minds.
Truth is, I still have occasional sex with guys, only because its so damn nasty!
The first guy I jerked off came on my face in the dark. At first, I didn't know what happened, he hit me above my eyebrow - took me a few seconds to realize he had just come on me.
I told him, "next time, let me know and I will take it in my mouth." The next time he slept over, we did the usual fooling around, but as he got close to spurting, he told me "now!" And I put my mouth over the head of his penis. His spurt hit me in the back of my mouth - hitting my molars.
After that, at different sleep-overs, I had him spurt into a cup (and I ate it). Mostly, I just let him come in my mouth though. He wasn't as interested though - I don't think he ever made me come.