I see that there are already 4 pages of replies and I'm too lazy to read them all. Here's my take, and I hope that I'm not just repeating the same old stuff.
Remember the Northern Pikes song, "She's not pretty, she just looks that way"? How about "You're just a 3 dressed up as a 9"? Most hot young chix aren't that pretty, they just clean up nice. Get them out of their makeup, let their hair down, trade the miniskirt for some jogging pants, and suddenly they're normal. Two years after you marry them, they'll start getting old, they'll lose what's left of their looks, and start gaining weight. Take a good look at her mother and her fat ugly older sisters. That's what she's gonna look like by the time you make it to divorce court.