Ingo Arndt / Leopard slug (Limax maximus) mating, hanging from a rope of mucus. These slugs are hermaphrodites and can be seen here transferring sperm to one another through their male organs.Switzerland. Sequence...

Ingo Arndt / Leopard slug (Limax maximus) mating, hanging from a rope of mucus. These slugs are hermaphrodites and can be seen here transferring sperm to one another through their male organs.Switzerland. Sequence...

Steve Downer / Pair of Black slugs (Arion ater agg.) mating, showing external sperm transfer, Birmingham, England, UK, October.

Steve Downer / Close up of a pair of Black slugs (Arion ater agg.) mating, showing external sperm transfer, Birmingham, England, UK, October.

Steve Downer / Close up of a pair of Black slugs (Arion ater agg.) mating, showing external sperm transfer, Birmingham, England, UK, October.

Steve Downer / Pair of Black slugs (Arion ater agg.) mating, showing external sperm transfer, Birmingham, England, UK, October.

Ingo Arndt / Leopard slug (Limax maximus) mating, hanging from a rope of mucus. These slugs are hermaphrodites and can be seen here transferring sperm to one another through their male organs.Switzerland. Sequence...

Tony Wu / Nudibranchs (Hypselodoris bullocki) mating, Lembeh Strait, North Sulawesi, Indonesia.

Pascal Kobeh / Nudibranchs (Nembrotha lineolata) mating, they are hermaphodites but need another individual for reproduction, Sulu Sea, Philippines

Pascal Kobeh / Nudibranchs (Nembrotha lineolata) mating, they are hermaphodites buty need another individual for reproduction, Sulu Sea, Philippines

Pascal Kobeh / Anna's nudibranchs (Chromodoris annae) two looking about to mate, Sulu Sea, Philippines

Alex Mustard / Pair of Barred hamlets (Hypoplectrus puella) spawning at dusk. This species is hermaphrodite. Wreck of the Oro Verde, Grand Cayman, Cayman Islands. Caribbean Sea.