Supply and Demand....Curve?

I like it when there's articles about animals and then whomever always tries to Humanize for the lay (sp). Here's another case in point:

Study: Monkeys 'pay' for sex by grooming

I love it when he compares "Monkey Love" to the simply supply and demand rational. It's like the Republican trickle down effect but only with a little tickling and a tug and pull at the end. It's all the same when we think about it, we tend to pay now for sex. Instead of a little grooming action it's flowers, dinner, jewelry and the patience when she talks your ear off about nothing! Oh, how times have changed.....grooming is so much cheaper!!

-mike