Analysis of information sources in references of the Wikipedia article "女陰摩擦" in Chinese language version.
A common variation is 'tribadism,' where two women lie face to face, one on top of the other. The genitals are pressed tightly together while the partners move in a grinding motion. Some rub their clitoris against their partner's pubic bone.
Rubbing genitals together or against other parts of a partner's body can be included in any couple's sexual interaction and is common in lesbian lovemaking... ...Many lesbians like [tribadism] because it involves all-over body contact and a generalized sensuality. Some women find the thrusting exciting; others straddle a partner's leg and rub gently. Some rub the clitoris on the partner's pubic pone (Loulan, 1984).