This is the weakest of the "insegnante" (schoolteacher) series, at least of the ones featuring Edwige Fenech. (Director Tarantini did a virtual re-make of this movie a year later without the genuinely talented Renzo Montagnini and replacing the sexy and talented Fenech with the merely sexy Anna-Maria Rizzoli, which is definitely even weaker). Despite the title, Fenech here isn't really a teacher. I think she's SUPPOSED TO BE a piano teacher or something, but really she's just some sexy woman staying in a luxury hotel. She's the kept mistress of a wealthy politician (Renzo Montagnini) who neglects her(the idiot!). She is being pursued by the married manager of the hotel (Lino Banfi), the dimwitted bell-boy (Alvaro Vitali), and the manager's handsome son. They spy on her in the shower and engage in various hare-brain schemes to get in her panties, but it shouldn't be too hard to figure out who she's going to ultimately end up with.
Obviously, the main appeal of these movies is Edwige Fenech and other various bella donnas appearing with or without all of their clothes. But I've seen a lot of these now, and they have a strange way of growing on you (not unlike some horrible fungus). They are also not all equally dreadful. It actually depends a lot on the director. Tarantini was a hack by anyone's standards and clearly inferior as a director to Marino Giralamo or Mario Laurenti, who directed several of the other "schoolteacher" films. Laurenti and Grirlamo were in turn inferior to the true masters of 70's Italian sex comedies like Pasquale Campanile Festa, Sergio Martino, and (believe it or not) Lucio Fulci.
Montagnini and Fenech were genuinely talented actors, but this a long way from being their best work. Even buffoons like Banfi can sometimes be funny and Vitali at least tolerable in the right movie--but this definitely is not the right movie. This movie isn't entirely worthless (never underestimate the appeal of Fenech's incredible breast and beauteous backside), but it's definitely pretty close.