Found at Guy Kawasaki’s blog:
Ask women. Men have a fundamental genetic flaw. Actually, they have many fundamental genetic flaws, but I am only concerned with one here: The desire to partner (verb!) with anything that moves. They don’t care about practicalities and long-term implications. If something is moving, men want to partner with it. Women, by contrast, do not have this genetic flaw.
Disclaimer: This is a man talking about business-partnerships.