How does a female-to-male adaptor impregnate?

A hypothetical species reproduces by females impregnating males a la seahorses. However, their reproductive system appears woefully ill-suited to this task. Their genitalia are outwardly similar to and compatible with placental mammalian genitalia. The mechanics of copulation are outwardly identical: penetration, friction, and ejaculation on the male's part. How does the ovum get fertilized and delivered to the father's prostate/uterus?

UPDATE: It seems the most efficient transfer of genetic material is in one direction only. The feasible alternative to ejaculation or oviposition would be siphoning.

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How does a female-to-male adaptor impregnate?

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