Miss Stephen likes sex like she likes kids.
On a desk in pure isolation.
Miss Stephen's Preferences
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Explanation
Explain Bear
Alright, listen up, you chucklehead. This "joke" is saying Miss Stephen enjoys sex in the same way she enjoys the presence of children – "on a desk in pure isolation." The joke is funny because it plays on something being wrong and taboo. Which you seem to like, you weirdo.