The problem is, you are using dictionary words that pre-date the current understanding of sexuality and, indeed, what it means to be a biological creature.
Sure, centuries ago, people were neatly defined as heterosexual and homosexual. Eventually, some came to understand that there were people who could and would "go either way" and so bisexual was added to the dictionary. But, today, most reasonable people realize that sexuality - like nearly all things related to the psyche - exists on a continuum with no hard defined points. If "totally straight" is defined as +100 and totally homosexual as -100, then there are people who exist at every single point along the way and only an extremely small minority who exist at exactly +100 or -100. In fact, those who are at either of those extremes are probably good candidates for psychological counseling to ascertain the reason for their inability to accept the fact that those points do not exist in real life.
And, as has been pointed out, no "totally, 100% straight" dude such as yourself would join or spend time on a board that is all about penises and photos thereof.
So, methinks thou dost protest too much.
On the other hand, the last time I personally touched another penis, I was in the early stages of puberty...
