males and females have multiple partners and there are no long-lasting bonds formed among them.

a mating behavior in which the male and female do not form lasting pair bonds; one male may mate with several females, or one female with several males (Morris 1992).

Someone who is promiscuous has many sexual partners; the opposite of monogamous.

The term used to describe animals that copulate with several different partners within a short time span. Although the pair bond in Purple Martins is monogamous, males are highly promiscuous and will copulate (often forcibly) with any fertile female they can. Recent evidence suggests that subadult female martins are also highly promiscuous, "wanting" their eggs to be fertilized by older, genetically superior males. Compare with "Polygamous" and "Monogamous."

Referring to a mating system where a member of one sex mates with more than one member of the other sex, and each relationship is ephemeral and terminates after mating without a social bond being formed.