All guys should experiment with at least 5-10 penises over a couple of years, to find out their true sexuality. There is a difference between being bitch-fucked inthe ass by a powerful Bull and wanting to screw men as often as you can.
If you want a penis in your ass, you probably are not gay, more likely a submissive whose feminine side is demanding sex.
If you look at other guys and your penis goes stiff and you imagine your penis up their ass and you pinning them down with your thrusting, you might just be gay.
You could also like to fuck both men and women, thereby naming yourself, "Bi-sexual", and which gender you fuck the most, depends on the quality of lovers available.
Quite a few married women with children discover they prefer a woman as a lover, and suddenly the two husbands get told they are not needed anymore because the two women and all the kids are moving into one house together.
A lot of guys would like to be bitch-fucked by a dominant male, but are too scared to admit it because wifey might be too shocked at her hero revealing he actually is preferring to wear female underwear.