And I still stand by my statement. The men you are describing do not fit the description of the men I talked about in my third paragraph above. I, too, would define these men as gay or maybe bisexual. A man who "can't keep a cock out of [his] mouth" isn't straight.

Perhaps you've never known a man who was primarily heterosexual but dabbled a bit with men, maybe as a one time thing, but I have. Several, in fact.

When I was in my early thirties and had been an out gay man for more than ten years, I had an affair with a woman. She knew I was gay and was OK with it. In our circle of friends, men and women, gay and straight, we were regarded as a couple, but I never stopped thinking of myself as a gay man while the affair was in progress. She and I had several MMF threesomes, mostly with straight men. Most of these men were reluctant at first to be in bed with another man, even with a woman present, but they all warmed up to the idea pretty quickly. They all French kissed me (generally the first time with a man) and all but one sucked my dick. On one occasion the lady left the room for an extended period of time leaving me alone with the other man. When she was gone he went to town like you wouldn't believe. 'Sucked cock like a champ. Later he told me that since he had never been with a man before and might never get another opportunity he wanted to fully experience it.

I've also met several straight men on my own without the woman. Many were first timers and maybe even one timers who just wanted to see what it was like.

As Silhouette has mentioned, Dan Savage has discussed this at length in his column Savage Love (savagelove.net). And I'd still like to hear what the experts have to say on this. If there are any sexologists or psychologists out there please comment. If I am wrong, I'll retract what I said.