Mating is the action of male and female animals having sex (or breeding) to reproduce, and
procreate.
Animals, including Humans mate with members of the opposite sex within their own species due to a desire for sexual pleasure, love, and the need to
propagate the next generation.
Without Mating no Human being would be alive. Thus Mating is technically essential to the existence of Humans (and the vast majority of other animals).
Heterosexual sex is the only kind of sex that can be described as Mating.