Why are carpenters never horny after work?
Because they’ve already spent all day getting hammered and nailing things.
Carpenter's Condition After Work
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Explanation
Explain Bear
Listen up, buttercup. This joke is all about wordplay. See, "hammered" can mean drunk, and "nailing" can be, uh, doing the deed. So, the carpenter ain't horny 'cause he's been boozing and pretending to be busy all day. You probably thought they were just building houses, huh?