You loved donkey girls, but they were always so intimidating...at least the local ones were. Tall, statuesque. You'd always assumed they'd never give you the time of day, and this one must've sensed that, considering how she made the first move by matter-of-factly offering a ride. Once you stopped stammering and regained your composure, you soon found yourself lost in your own personal heaven.
According to her, all the girls like her are pretty much constantly ready for a few minutes of fun, and frustrated by how little they get offers. Between braying grunts, she encouraged you to flirt with some of the others, and they'd probably all drop whatever they're doing and drain the life out of you.
So, lesson thoroughly learned, and filed away for later.