Juvenile male dolphins engage in same-sex sexual play, including inserting the penis into another male's blowhole. This serves as practice for later mating and forges bonds between males. Males who played more as juveniles later had greater reproductive success.

Juvenile male dolphins engage in same-sex sexual play, including inserting the penis into another male's blowhole. This serves as practice for later mating and forges bonds between males. Males who played more as juveniles later had greater reproductive success.