To produce (offspring); to give birth to. If it wasn't for my mother breeding me, I would not be here. Of course, she can't take all the credit. My father helped out as well.
To inject semen into a woman's vagina. The anus does NOT count toward this - breeding must be just that - attempting to impregnate a woman by injecting semen into her vagina with a penis.
Buffy got so hot she begged for him to go ahead and breed her instead of pulling out.
Breeding is the action of male and female animals having sex (or mating) to reproduce, and procreate.
Animals, including Humans breed with members of the opposite sex within their own species due to a desire for sexual pleasure, and the need to propagate the next generation.
Without Breeding no Human being would be alive. Thus Breeding is essential to the existence of Humans and all animals (except for the ones that reproduce asexually).
Heterosexual sex is the only kind of sex that can be described as Breeding.