★ 1.0
★ 10.0
★ 6.0
★ 6.2
★ 7.0
★ 5.5
★ 0.0
★ 7.3
★ 2.0
★ 5.1
★ 3.0
★ 5.0
★ 5.9
★ 7.6
★ 7.8
★ 2.3
Scientists explore the sexual behavior of animals like rats and peacocks before looking at how desire works in male and female humans.
