A friend of mine wrote this on facebook. I find it to be quite accurate, so I thought you guys might enjoy it:

"The reason why there are so few serious relationships of 20-something men dating (20-something+5) women is that for such a relationship to exist, she needs to be bullish in a trade where she buys a deep out-of-the-money call on him and sells him a longer-dated put on her (i.e. she capitalizes on volatility of the underlying assets)."