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A man is so head-over-heels for a woman that he'd suck her dick just to be with her. Even if she turns out to be a guy in a dress, he still does it because he's too dumb to care.
My guy friend asked out a girl, only to find out she was a guy. He still sucked her dick because he was too in love to care.
I told my brother he'd suck her dick if he didn't get a date. He got a date, but it was a guy. He still sucked her dick.
My cousin said he'd suck her dick for a kiss. She turned out to be a guy. He still did it. I don't even know how.