The amphibian analog
. During amplexus, the male is facing the female's back, with his front limbs grasping her waist. Amphibians have no external genitalia
, so all that happens is they release sperm
s at the same time.
Frogs sometimes aren't too picky about who/what they choose for amplexus. They have been observed making it with rocks, shoes, and animals other than female frogs.