A lot of the movies from that era are like that, or worse. Like that scene in Revenge of the Nerds where the one nerd dresses up in the Darth Vader knock-off costume that the hot cheerleader's boyfriend was originally wearing and only reveals his identity after he bangs her. I had no idea watching that as a kid that this was a straight-up rape scene, but it's horrifying now.
And apparently the cheerleader didn't care that she just had surprise sex, as the nerd's superior lovemaking skills caused her to immediately fall in love with him. So it all worked out.
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