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The reference is that the numerals 6 and 9 are inverted versions of each other, reflecting the physical position that a couple must adopt when engaged in the sexual practice of simultaneous oral sex. Your friends are uncomfortable with discussions of human sexuality.

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6y ago
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6y ago

They are probably reminded of the sex position which is known by the name "69".

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Q: Why do my friends laugh when we get to number 69 in maths?
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