Which hormones are essential for male fertility aside from testosterone? what does each one do?

There is a brain: Hormone (ghrh) which causes your pituitary to put out fsh, which stimulates sperm production -- and lh, which stimulates testosterone production. Your thyroid level also needs to be somewhere near normal.

Testosterone, FSH: Many hormones are essential for normal male fertility. The ones we typically measure during the infertility evaluation are testosterone, fsh, lh and prolactin. See: http://theturekclinic.Com/services/male-fertility-infertility-doctor-treatments-issues-zero-sperm-count/male-infertility-evaluation-sperm-test-semen-analysis-san-francisco-los-angeles/.