Never Enough(1984)

A journalist working with an economics magazine that has fallen on hard times decides to boost sales by doing an article about an award ceremony to honor the best female writer of an erotic novel. His research takes him into the intimate lives of three of the contestants, and he is delighted to find that their sensual abilities extend further than just writing about it. He is willingly seduced by all three and has the exhausting but erotic job of comparing their amorous appetite in his report. His girlfriend has been secretly observing all of this, and is decidedly jealous...But she has a plan to surprise him. It all come to a head at the award banquet, when, in a shocking surprise, an amateur wins first prize, a writer who just happens to be his girlfriend who has written a book about his exploits!