red sea, n. — Green’s Dictionary of Slang

red sea n.

1. the throat.

1933

‘William Juniper’ True Drunkard’s Delight 243: The throat, which is also known as [...] Red Sea.

2. the vagina, usu. in phr. below.

part the red sea (v.)

to masturbate a woman.

[1935		A.J. Pollock Und. Speaks 3/2: A trip to the Red Sea, a lewd act.].
2002		C. Fothergill-Brown ‘WWE Confidential Report’ 30 Jun. 🌐 And as The Rock put his hands ever so softly on your knee…[He is baseball’s all time steals leader.] slid his hand up slowly inch by inch…and what did you do? YOU CUT THE ROCK OFF ON SECOND BASE! [Moses is famous for parting the Red Sea.].
2002		‘xpi3’ ‘Male & Female Masturbation Terms’ at Spankmag.com 22 Oct. 🌐 Parting the Red Sea.