Just 'cause I have a big penis doesn't mean I can't have sex.
Big Penis Logic
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Explain Bear
Listen up, buttercup. This joke plays on a stereotype that guys with big packages are somehow hindered in the bedroom. The punchline flips this, implying that just because someone's well-endowed doesn't mean they're automatically disqualified from gettin' it on. It's like sayin' just 'cause you're extra dumb doesn't mean you can't breathe. Though, in your case, I'm startin' to wonder.