Here's one I always liked a lot, being gay myself:
A man and a lesbian are sitting together talking. The man begins to brag about his prowess at pleasing women, and grins. "I bet it must be hard for you," he says. "At BEST you'd have to act like a man to get even close to my level!"
The lesbian shrugs and says, "Actually, I could steal any girl you go after."
The man laughs and says, "Impossible. Let's have a contest - whoever can convince the most women to go home with them wins." The lesbian agrees, and the next night they head out on the town to meet as many women as they can.
At first he starts out confident, but night after night, after hours of flirting and sensual chatter, the lesbian calmly walks up, leans into the woman's ear, whispers something, and each woman excitedly gets up to leave with her. No matter what technique or approach he uses, every woman leaves with the lesbian.
Finally, after days of frustration, the man demands to know what she is saying that is making all of these beautiful women choose her over him.
The lesbian shrugs again and says "Well, you know that thing women are always begging you to do?"
The man hesitates and thinks for a moment, and then ventures, " ... foreplay?"
"Yeah. Well lesbians have another word for that. We call it SEX."
(As a side note I don't believe in hitting on straight women or having "contests" to see who all you can sleep with but the punchline knocks me off my feet every time :roflmao:)