A film about a female who cannot find her perft partner?

film about a female who cannot find her perft partner and one day she goes a computer fair with her geeky m8 and she goes inside a machine that she gets to creat her perfect partner and an explosing goes off and it creats her but in a mans body and he thinks that he is a she but she is still walking around thinking njothing has happend and thats all i can remember from it ..