This topic always generates a lot of strong opinions. Those from the straight camp can reaffirm their "straightness" while those from the in between camp can argue that it depends and a few from the gay camp can assert their difference.
The assumption is that there are three sexual preference camps, straight, gay and bi-. But what if preferences change over time. I know several openly gay men who were once married, had families but at some time in their life they began to feel the pull toward other men. One that was so strong that they left their marriages and found other men as partners.
I don't know any answers but I wonder if these pigeon holes are not pigeon holes at all but just descriptions of complex sexual feelings that change with time and perhaps even with certain circumstances.
One aspect of these discussions always surprises me. Many declarations of being sexually straight seem to imply a certain dislike or disdain of other sexual orientations. Why are we as cross dressers, who often plead and beg for acceptance, so moralistic and judgmental? We of all people should be as tolerant and understanding as possible yet we have groups like the Beaumont Society that barred any cross dressers who were not heterosexual and even were wary of single cross dressers. Its an enigma.