"Even though you're nude for your treatment, legitimate spas don't offer happy endings and it's a serious breach of spa etiquette to ask for one or show signs of sexual arousal, like groaning in a suggestive way, moving your hips, or for men, allowing an erection to pop the sheet up. If you go there, the therapist has the right to end the massage immediately."
http://spas.about.com/od/spaetiquett.../spanudity.htm
So how the fuck you suppose to stop yourself getting a hard on if a woman has just been rubbing you up and down?