The bizarre mating behavior of hermaphroditic sea slugs — which involves stabbing penile appendages and hook-like penis spines — may have hidden benefits despite its wear on the body, new research ...

Female sea slugs mate more frequently than required to produce offspring, despite the highly traumatic and biologically costly nature of their copulation, as reported Aug. 22 in the open access ...

An Australian sea slug uses a spike to inject fluid into the head of its mate during intercourse, researchers have found. THERE ARE MANY WEIRD mating practices in the animal kingdom, but researchers ...

Sexual interactions in so-called cross-fertilizingsimultaneous hermaphrodites, such as earthworms, snails, leeches, andsome fishes, have long challenged researchers' understanding of howestablished ...