Tyler only has a kid because they don't make condoms the size of Lego Men.
Lego Man Condoms
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Explanation
Explain Bear
Listen up, buttercup. The joke is that Tyler had a kid because condoms aren't big enough to fit over his, uh, little guy. Get it? It's saying he's got a Lego man-sized you-know-what. And you, my friend, probably think a thesaurus is a dinosaur.