How is female sexual organ called what it is, and how was a male genitalia nicknamed a lizard?

Question

How is female sexual organ called what it is, and how was a male genitalia nicknamed a lizard?

Answer 1

1682, from L. v****a "sheath, scabbard" (pl. vaginæ), from PIE *wag-ina- (cf. Lith. voziu "ro cover with a hollow thing"), from base *wag- "to break, split, bite." Probably the ancient notion is of a sheath made from a split piece of wood (see sheath). A modern medical word; the L. word was not used in an anatomical sense in classical times. Anthropological v****a dentata is attested from 1908.

As for the male thing, I am not completely sure.  I have taken AP Biology in High School, and I know that they shed their genital(the males) skin everyday, so perhaps they are the "masters" of the genitalia? xD