Definitions by Jonhathan Doe

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.

Biology by Jonhathan Doe December 31, 2007

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?

Physics by Jonhathan Doe December 31, 2007

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!

Chemistry by Jonhathan Doe December 31, 2007