Biology

1. Sex
2. Sexual intercourse
3. The study of sexual intercourse

Let's study your biology with a special reference to your reproductive system.

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Chemistry

Referring to that which usually comes before sex. The exception is when intercourse is preceded by the exchange of green ink-dyed cotton.

We had some serious chemistry! After that we mixed some chemical compounds and that's how we got little Joey!

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Physics

Sex. Based on the idea of "Let's Get Physical"

The study of forces involving pelvic regions.

Hey baby, you wanna study some physics back at my place?

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