Actual coverage will always differ somewhat from what is printed here. No need to find mates. Bringing gametes together . Many variations of mating strategies.
Most aquatic animals have genital pores, both squirt out large quantities of eggs, sperm.
At puberty, testosterone stimulates development of secondary sex characteristics. In adulthood, testosterone secretion maintains sperm production, sexual behavior. High levels of testosterone trigger brain cells, stop testosterone secretion. Ovary not only prepares egg, but controls hormones needed to supply uterine tissue so it can nourish embryo. View diagram of oogenesis in ovary egg released from ovary, passes through fallopian tube , reaches uterus.