a sample, if you will:
Murbella found that she no longer could control all of her own responses. She was reacting automatically from some well of knowledge deeper than her training. She felt her vaginal muscles tighten. She felt the swift release of lubricant fluid. When Duncan entered her she heard herself groan. Her arms, her hands, her legs, her entire body moved with both of the response systems - well-trained automation and the deeper, deeper plunging awareness of other demands.
How did he do this to me?
Waves of ecstatic contractions began in the smooth muscles of her pelvis. She sensed his simultaneous response and felt the hard slap of his ejaculation. This heightened her own response. Ecstatic pulsations drove outward from the contractions in her vagina... outward... outward. The ecstasy engulfed her entire sensorium. She saw a spreading blaze of whiteness against her eyelids. Every muscle quivered with an ecstasy she had not imagined possible for herself.-Heretics of Dune
so we are to believe that this is part of a 13 year old's required school reading. 🙄