make the beast with two backs

To engage in sexual intercourse with another person, referring to the exposure of each partner's back when embraced in the missionary or standing position. I have my suspicions that, in secret, they are making the beast with two backs.

Common Names:

Name	Pronounced	Usage
Gioia	JO-yah	Italian
Shekinah	-	Various
Aurea	-	Late Roman
Julianne	joo-lee-AN	English
Nicostrato	nee-ko-STRAH-to	Italian
Leander	lee-AN-dər (English)	Greek Mythology (Latinized)