Sexual desire (women)
From Voyeurweb's Wiki about Sex
The sexual desire in women, their libido, starts as a teenager, peeks in their adulthood, lingers until an old age. When a woman's sexual desire wanes completely, she is dead.
In a cruel joke, the typical woman first has sexual desires in older men: father figures. She eventually finds a mate her own age, but as she grows old, her interest in younger vernal partners grows.