In women- Combined with estrogen, testosterone helps with bone mass, moods, and supporting reproductive health.
In males- It regulates libido, muscle mass, fertility, and sperm count.
In women- FSH is essential for the production of eggs by the ovaries. It also controls menstrual cycles.
In males, the role of FSH is to stimulate the testes to produce sperm.
In children- This rises before puberty begins and the development of secondary sexual characteristics.