The riding tribbing position is performed similarly to how a girl rides a guy. One lesbian lays down while another lesbian sits on top of her pussy and grinds and humps her back and forth. The lesbian on top has her pussy pressed against her partners on the bottom.
The reverse cowgirl tribbing position occurs when a lesbian rides her partner’s pussy, but instead of facing forwards, she rides her facing backwards.
Semi Reverse Cowgirl
The semi reverse cowgirl position is comparable to the reverse cowgirl position, but instead of facing straight, the rider’s body is turned to the side. The woman on top still rides her partner backwards, but she is riding her pussy at an angle as opposed to straight on.