Despite what the Southern Baptists may think, it's not sex that leads to dancing, it all stems from walking.

Not only do we have 2 feet, but walking is basically a 1-2, 1-2, etc. sequence. So it's 2/4 time (or at least some kind of 2-beat measure) that's the biggest no-brainer.
Everything else is 'fancy footwork'. ;-D