Just when you thought it was safe to go out ...

1. Every girl already has a boyfriend.
2. If you think things are going well in a relationship, you have overlooked something.
3. Given enough time, any relationship will end unhappily.
4. Everywhere in the world, women outnumber men. The only exceptions to this are the place you live and any place you may move to.
5. Women will talk to you if and only if they are unavailable.
6. No woman will treat you as badly as the woman you marry.

A few corollaries:

Farber's Fourth Law

Necessity is the mother of strange bedfellows.

The Heisenberg Principle of Dating

You cannot know both the location of a female and that she is single at any given time. If the location of the female in question is known, see Law #1

Katz's Law

Men and women will act rationally when all other possibilities have been exhausted.

Principle of Diminishing Returns

The amount of time you spend getting ready for a date is inversely proportional to how well it will turn out.