This being my area of expertise, it's hard to know where to start, but first and foremost, I consider myself a bio-dork, so I'll start there!
Biology of Youth-Universal
The biological purpose of reproduction creates attraction to a youthful appearance by both men and women.
Researches have found the female perception of beauty changes throughout the month (just like us woman to change our minds!). Women typically prefer a mature, masculine looking man. These characteristics include a heart-shaped face and small chin with full lips.
During menstruation, however, woman are typically more attracted to softer, more youthful features. These include a small nose, large eyes, and defined cheekbones (which males find...