Human male hormones have cycles, typically there is a 18-29 day cycle and a year cycle where various hormones go up and down.
Other things like seasons affect body chemisty. Emotions like lust, attraction, love, etc are all basically chemical actions taking place inside of the brain.
Perhaps you have a hormonal thing going on?
While they don't have a 100% certain set of criteria for homosexuality (or heterosexuality, they do know that body chemistry (including hormones) cause homosexuality. In fact its exposure to your mom's hormones in the womb that tricks the trigger that sets up your leanings toward homosexuality.
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I don't think it's strange at all. Though I only ever have the urge to sleep with men, I can get off to straight/gay/bi porn because, for me, sex is sexy and I'm a very sensual being. Just seeing anyone full of desire and pleasure is nice.
Many straight and gay people worry about being in their orientation 100% of the time, but I don't think sexuality is that simple. Don't worry, you don't have to give up your "gay card". LOL
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