Why does this issue get people so annoyed? I suppose it's the terms we're using. There seems to be a division between those who define sexuality by behaviour, and those who consider it a matter of self-image; I'm not sure either is adequate. I mean, saying 'a man who has any kind of sexual contact with another man is therefore not (totally) straight' seems rather extreme - what if he had just one experience in a lifetime of heterosexual relations? On the other hand, I can't take a guy seriously if he calls himself str8 but regularly screws around with other guys. Although I don't think frequency of sexual activity should be the only cobsideration either.
I used to think men were generally quite fixed, and that all those stories about apparently straight guys doing stuff with other men was mostly mythical. But over the years, I've seen a fair bit of that sort of thing. I've been pleasantly shocked by a few friends and acquaintances who were a lot more adventurous than I could ever have imagined. I also know guys who just wouldn't - or at least, it's not worth trying.
I find straightness very attractivein some ways, although I don't think I could adequately define it. For me, it's not about 'conversion', narcissism, or (I hope) arrogance. When I see an attractive man, I don't know (nor do I much care about) his sexual orientation. If something happens, that's great - I'm just grateful to have fun experiences, without too much baggage. For a serious relationship, however, he's got to be comfortable being with a man - otherwise I can't see how it would work.