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A year ago this summer, Priscilla Chan graduated from Harvard and moved to Palo Alto to live near her boyfriend, Facebook founder Mark Zuckerberg. But before she did, Chan and Zuckerberg, pictured, held a series of "negotiations" over how often she would get to see him, according to Sarah Lacy's book Once You're Lucky, Twice You're Good. The final contract, according to Lacy:

One date per week, a minimum of a hundred minutes of alone time, not in his apartment and definitely not at Facebook.

Chan recently squired Zuckerberg to his sister Randi's wedding. No word on who caught the bouquet, and Facebook insiders are mum about the couple's prospects of an engagement. Come to think of that, perhaps that's a good thing. If dating was this tough, can you imagine working out the prenup?