In another myth, the nymph Salmacis became smitten with the youth Hermaphroditus, son of Hermes and Aphrodite. She attacked him while he was bathing in a pool and asked the gods to unite them forever. Immediately, Hermaphroditus and Salmacis became a single creature, half-man and half-woman. Nymphs could also be jealous lovers. More @Wikipedia
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