Alien Gender Swap Experiment

College freshman Chris is having the time of his life at a party. The girl of his dreams is sitting on his lap, and things are getting hot and heavy. When she pulls him into the bedroom to get down and dirty, it looks like all his dreams are about to come true.

Instead, Chris is abducted by aliens. When he wakes up, he discovers that he has become a she, and the aliens want to see what makes a human female tick.

First comes the medical exam and probes, and then... mating.