WOW! This thread had a two year "rest" before it got bumped!
Though I'd posted in it, early on, I didn't remember it at all! So ... had to read it, completely, over again! Great thread!!
And ... I don't believe I ever answered the original question!
When I KNEW I was Gay, and when I finally admitted it, are two very different things!
As was "expected" of me, I was quite the "ladies man" through out my twenties. But, there were a "few" ... well, more than just a few ... Guys that I'd "played" with in there too!
When did I discover that I liked Guys? Must have been when I was 10, or so. Had been getting naked with everyone I could since I was 5 (precisely because it was a "Bad Thing"!)
So ... it wasn't the getting naked part, but when I was 10, or so, was the first time I hugged another naked Guy, and touched dicks! What a rush!! It helped that we were both HARD at the time!!
But, I also liked the feel of his muscles, chest and abs, pressed against me. And, the way he smelled, and looked. We were both too young to "get off", but we had lots of fun getting naked and feeling each other's bodies snuggled together, and our feet on top of each others'. (This "happened" with more than just one other Dude!)
Other than "playing" with naked boy friends, peeing in front of each other, jerking off together in the woods (but not touching each other), the usual showing off "macho" stuff that guys will do, I didn't have an actual "real" sexual encounter until I was in college.
My first blow job was a mutual 69 with a guy in my dorm. And, to my own surprise, I swallowed all the cum he shot into my mouth and throat!

I discovered that I liked the taste of Male CUM!!
Though I was still fucking Girls, at the time, it was then that I fully knew that I preferred Guys! But, I didn't fully admit that, to myself, let alone anyone else, for another 10yr.!!
If only I had KNOWN Then what I Know NOW!! (I've hit my Smilie limit! *tantrum!*)
Keep smilin'!! *kiss* *hugs*
Chaz ;-)