Women are full of tricks and artifice because we are expected to be so. If she was a non bra wearing, non shaving, no makeup having, mussed up hair, wearing torn sweats to the market chick most men wouldn't have the time of day for her. Rarely do I go out a mess, but when I do, I get far less attention. It is human nature, that's all.
By the way, if I was mashing with a guy and in the middle of the clinch his hair slid on to the pillow, I would probably roll off the bed in a fit of hysterical laughter.