Final answer:
Insects with no pair bonding and indistinct mate choice exhibit a promiscuous mating system, which is different from monogamous or polygynous systems.
Step-by-step explanation:
Insects that do not show pair bonding and where both males and females will readily mate with any available member of the opposite sex exhibit a promiscuous mating system. Unlike monogamous systems, where one male and female pair for at least a breeding season, or polygynous systems, where one male mates with multiple females, promiscuous mating involves neither long-term bonds nor any exclusive sexual relationships. This strategy can be beneficial in a context where ensuring reproduction is more critical than forming pair bonds, and there are enough mates available to avoid competition for sexual partners.