The Sleepingbagorean Theorem
The Sleepingbagorean Theorem proves that increased comeliness and cunning equals a greater amount of sexual tension. It can best be explained by this graph:
The simple mathematical equation:
2A * B = Y^2
Wherein two times desirability (A) multiplied by kickassedness (B) is equal to sexual tension (Y) squared.
Smart is sexy. While that accurately describes Mulder and Scully, it was a snowball effect from humble beginnings.
See how the theory applies to The X-Files