How do chimps attract mates?

Answer 1

The genitals of the female Chimpanzee balloons into a giant pink swelling during her time of estrus. This is when she is most susceptible to becoming pregnant. The pink coloring and smell of hormones lets potential suitors know that she is receptive. The alpha male usually gets to mate first, followed by those who are aligned with him. Some younger males must mate in secret in order to avoid a fatal beating or exile.

As for males, different communities use different methods. One uses something known as "leaf cutting." They do this by stripping the membrane from a leaf stem with their mouth. The noticeable "zipping" noise attracts the attention of estrous females. Males sometimes bypass this by just shaking tree limbs. Others sit on the ground with legs apart in order to display their erections.