貝合わせ
Tribadism is a sex act in which the vulva of women rub against each other for sexual stimulation, especially for mutual stimulation of the clitoris.
For pussy-to-object rubbing, use
crotch rub instead.
For pussy-to-penis rubbing without penetration, use
grinding instead.
For pussy-to-body rubbing, except genital, use
frottage instead.