When a male and female crayfish reproduce

the process of male and female coming together to join egg and sperm cells

(verb) - the pairing of a female and male in order to breed and produce offspring.

The act of insemination where one or more matings in the same heat period comprises a service.

The process that determines which (selected) males are bred to which (selected) females.

Torque required to couple/uncouple a mating pair of connectors or contacts.

mounting of the male onto female after courtship; male inserts syringe needle-like structure of his genital bulb into opening in the female's epigynum and transfers the sperm

In biology, mating is the pairing of opposite-sex or hermaphroditic internal fertilization animals for copulation and, in social animals, also to raise their offspring. In some birds, for example, it includes nest-building and feeding offspring. The human practice of making domesticated animals mate and of artificially inseminating them is part of animal husbandry.