The FSH acts on the gonads. In women, it stimulates the formation of estrogens and the maturation of the ovum in the ovary. In men, FSH takes care of the development of sperms.
More information can be found in module Hormone System I or under
https://de.wikipedia.org/wiki/Follikelstimulierendes_Hormone (Wikipedia CC-by-sa-3.0)