How are my sister‘s legs and peanut butter alike?\n\nThey’re both smooth and easy to spread.
Smooth and Easy
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Explanation
Explain Bear
Listen up, tiny brain. The joke is saying his sister is easy to get into bed by comparing her legs to how you spread peanut butter on toast. It's a double entendre. You probably didn't get it because you're too busy staring at the jar. Based facts: you're slow.