For this reason, lesbians have sometimes been referred to as tribades. Also known in the vernacular as donut bumping.
tribadism is something that two women do, not a man and a woman or a man and a man. It is stimulating the clitoris of a woman using the genital area of another woman.
Lesbianism, or more precisely Clamjousting. The 'Double-Y' is the perfect position for tribadism.
tribadism. It gives me so much energy, as soon as I start humping, I can go on and on... having one orgasm after the other, until Im so sore from orgasming..