Looking for a movie title (PS it's not Firestarter, this is definitely a comedy)

Movie about a girl whose mother is trying to prevent her from dating/growing up by convincing her that she has pyrokenesis when she becomes aroused. At some point her boyfriend has to shower and he puts Nair on his crotch (as handed to him by the mother). At another point the girl takes an ice bath trying to cure herself. I remember this as a comedy and the mother and daughter pair as Ricky Lake and Shirley MacLaine but that's clearly incorrect. This was almost like a Saturday afternoon B-movie style show.

Thanks for the help!