When a girl straddles her male partner and rubs her pussy on and along the underside of his erect penis, without actual vaginal penetration. May be an
adjunct (foreplay, playful
coital interlude, serious clit mashing) or alternative to coitus.
Kimmie wants to keep her hymen, but she loves
69ing, anal, and riding the rail.
I love Tina
double-edging us by riding the rail, so we supplode together when she finally shoves it in.