We are all human beings, with differences, thank God! Accept them, do not judge.
A person's likes and dislikes, sexual leaning, sense of humour, the way he/she walks, their personality, character, foibles, idiosyncrocies, all go together to make yet another wonderfully interesting human being.
I know exactly what you mean RisiaSkye... I've never made an assumption about someone that am friends with or worked with. I can usually tell myself, but anyone can be wrong. I usually don't even think about people's orientations anymore... mainly because a) isn't none of my business and b) I might be wrong. The only time I've made a mistake was when I was "interested" in someone. And I think, at that point, you have to kinda find out if you want to take the relationship further. Unfortunately, I did find out.. and she was gay. Bumper for me. I was wrong in that one case. And we'd been friends for over a year. You'd think I would have figured something out in that time lol. Her orientation and who she was dating just never came up in our friendship. But, I think, because I had a little crush on her, I assumed she was straight. Shame on me.
If I were an impossibly logical 17th century french mathematician/philospher this would be my answer: "when in doubt, assume they're straight." I would justify this maxim based on the following reasoning somewhat like Pascal did to determine whether or not he'd be better off believing in God or not. I'd have to consider the likelihood of guessing either incorrectly both ways as well as the degree of potential offense taken if either guess turns out to be wrong.
First, the statistics tell us any given person is more likely to be straight. (However, if the man in question owns a pink chandelier, one may have to adjust his probabilities.)
Second, I imagine that in general mistaking a straight person for a homosexual would cause more offense than mistakenly calling a homosexual straight.
Therefore, when in doubt, straight's the safe bet.
Of course, if the guy wears shoes with buckles, all bets are off.