A sea slug newly discovered in the Pacific Ocean has a disposable penis – it can detach it and regrow it within 24 hours. The penis is also spiny, and the spines may help to remove a competitor’s sperm (ouch).

The sea slug, called Chromodoris reticulata, is both male and female (hermaphrodite) and can use both sets of sexual organs at the same time. Speechless!

Read the original paper in Biology Letters.