Sexology - The depth of female pleasure

Tess is a PhD Biology student, who is writing a paper on how pace, position and stimulation all affect the quality of female sexual pleasure. For this study Tess must do a lot of observational and hands-on research. So what do women really want? What about her professor? Who seems to be completely unaware of his horny assistant, he never paid much attention before, he was too busy writing... but she seems very willing. Maybe a chance for some observation...