Testosterone is sufficient for the development of male secondary sexual characters. Meiosis II will not occur in a spermatocyte unless it fertilizes an egg. Sperm production occurs in a regular, monthly cycle. Male sexual hormonal control is steady state not cyclical. Spermatogenesis following erection Capacitation following ejaculation Implantation following fertilization Ovulation following the LH surge.
Gonads begin differentiation into ovaries or testes by the seventh week after fertilization.
The ovaries normally descend into the scrotal sac prior to birth. The scrotal sac is equipped with muscles that may raise or lower the testes. A primary function of the seminal fluids is to lubricate the penile glans. The drug Viagra assists males in attaining and maintaining a penile erection by increasing muscular contractions at the base of the organ. Estrogen is produced by the follicle and, later, by the corpus luteum while progesterone is produced by the anterior pituitary.