Why is hand holding a couple thing? Because they touch each other's genitals anyway.
The Logic of Hand Holding
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Explanation
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Explain Bear
Listen up, buttercup. This joke is saying that couples hold hands, but that's kinda pointless because they're probably already doing stuff that's way more intimate, like touching each other's private parts. It's like saying, "Why bother knocking on the door if you're just gonna kick it down anyway?" You probably knock on doors a lot, don't you?