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Siphotperon sp. A simultaneous hermaphrodite, the slug has both male and female reproductive organs that it uses simultaneously during sex shown here. For its male organ, the slug has a two-pronged penis consisting of a penile bulb that transfers sperm, and a separate, needlelike appendage called a penile stylet that stabs and injects partners with prostate fluid-containing sex hormones called allohormones. Here, a reciprocal copulation between the sea slugs with both penile stylets pst inserted into the mating partners' foreheads h ; the penile bulbs pb are inserted in the mating partners' female genital openings hidden behind the right parapods pa. The close-up photograph of a reciprocal copulation c shows the penile stylet of the left individual inserted into the forehead of the right individual. A typical copulatory sequence for Siphotperon sp.
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Photos: Bizarre Sex Lives of Hermaphrodite Sea Slugs
Sexual Conflict in Hermaphrodites
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