The same cells in the testes that produce testosterone also produce INSL3, but unlike testosterone, which varies over a man's lifetime, INSL3 is stable, with the level during puberty remaining basically constant and declining only slightly into old age.
Stress can impair sperm health and sexual function, which can result in infertility. Males with higher levels of stress were more likely to have lower sperm counts and it is a major problem for women's sexual health too. Here are tips and activities to reduce stress levels, promote better fertility
Male fertility tips: Here's all you need to know about the sexual health issues that men can face in their 30s and lifestyle changes they can make to avoid them.
The study demonstrates that a gene's expression is reduced in older females and increased in old males if the gene's expression is higher in the brains of young females than in young males, and vice versa for genes with higher expression in young males.