A partner left out of the room
Lesbian cheating needs three people and puts only two of them in bed. The third is a husband, a boyfriend or a girlfriend who is away or one room over, and keeping the secret from that person gives the sex its edge. Wedding rings stay on, voices stay low and clothes get pushed aside more than taken off.
Who strays and with whom
The roles are stock types. The one who strays is a bored wife, a woman with a boyfriend and a new curiosity, or a girlfriend tempted inside her own circle. The other woman is close at hand: a best friend, a neighbor, a coworker. In seducing a hesitant woman, the doubt is about wanting a woman at all; in a lesbian cheating setup, she already wants it, and the doubt is about getting caught. A variant lets the deceived girlfriend join instead of leaving, which turns the affair into sex between three women. The betrayal is scripted, and every woman on screen is an adult performer.
