mkha' gsang

མཁའ་གསང
secret center/ space, female organ [IW]

secret sky [RY]

secret sky [=bhaga]; isc. [contraction of nam mkha' and gsang ba'i rdo rje], female and male sexual organs (in union) [RB]

1) secret center, the secret space. Syn mo mtshan; 2) secret sky [RY]

female sex, space and the secret (female & male genital organs, padma & vajra) [JV]