This is an account told me by one of my favorite companions on my mission, Elder (Eli) Jones. We also shared many great spiritual experiences, but this isn't one of those. Here is what happened to him:
He was in a college class, and they were talking about gender and appearance I believe:
Instructor: What is the first thing guys notice about girls...come on, this should be easy...
Eli Jones: Uh, their butts?
Class: (awkward murmuring)
Instructor: Anyone else?
Other Class member: Hair?
Instructor: Yes. Hair. A girl's hair is typically the first thing guys notice.