If I'd Killed Him When I Met Him…

In the whiptail lizards, everyone is female- and the hatchlings have no biological fathers. But reproduction still requires heterosexual foreplay-the formality of copulation with males of other, still sexual, lizard species, even though they cannot impregnate the females-or a ritual pseudo-copulation with other females of the same species.

– CARL SAGAN AND ANN DRUYAN,

Shadows of Forgotten Ancestors