80s soft core movie with open plane scene

I remember seeing this movie on cable in the late 80s.  The heroine was a young woman (perhaps staying with an aunt in the country?). There was an obligatory shower scene. But the memorable scene is one in which she is being taken up by a young man in a plane with double open cockpit and nearly causes a crash when she grabs the moving joystick to use it for self-gratification.

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