Many male insects have specific structures (intromittent organs) that allow transfer of sperm internally to a female's reproductive tract. These structures have a specific morphology that only fits into the reproductive tract of a female of the same species, and results in internal fertilization. Having the lock-and-key fit also provides a:

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The specific morphology of the intromittent organ that fits only into the reproductive tract of a female of the same species is a form of pre-zygotic isolating mechanism, as it prevents mating between individuals of different species.

Many Male Insects Have Specific Structures (Intromittent Organs) That Allow