Zerophilia

"Part horror movie, part randy teen sex farce, [Zerophilia] takes the premise that some organisms are capable of mutating gender to suit their surroundings and extends it to an Oregon undergrad whose extra chromosome allows him to alternate between male and female. Martin Curland's endearing debut delivers a ripe conceit in such gendermorphic times, ... it could conceivably spawn an entire genre of imitators." -VARIETY