FSH promotes sperm production in the seminiferous tubules whilst ICSH stimulates the interstitial cells to release testosteroneMale sex hormone produced in the testes, which is responsible for puberty in boys..
Testosterone also stimulates sperm production in the seminiferous tubules and activates the prostate gland and seminal vesicles to produce their secretions.
The release of testosterone is controlled by a negative feedback system:
build up of testosterone concentration in the blood inhibits the secretion of FSH and ICSH from the pituitary gland
reduction of FSH and ICSH results in a drop in production of testosterone
reduction of testosterone concetration in the blood stops inhibition of FSH and ICSH production
the production and release of FSH and ICSH increases, stimulating increased production of testosterone