A bicurious man goes to a gay bar.
A gay man offers him a drink.
The bi man explains he doesn't know if he's gay or not.
"That's fine," he says, "let's just have a drink."
The gay man asks him for a dance, and he explains again he isn't sure if he's gay or not.
Eventually, the gay man invites him to go home with him to hang out as friends.
They get to his house, and the gay man says, "Do you fancy having sex?"
He isn't sure, so the gay man explains, "I'll push in slow, and at any point you want to stop, make animal sounds, and if you like it, start singing."
So they get to it, and the gay man pushes in slowly, the bi man bursts out "MOOOOO MOOOOO MOOOOOOVVVEE CCLOSSEEERRRR"