There’s been some really interesting efforts from filmmakers merging horror, comedy, and sex.  There was Mitchell Lichtenstein’s Teeth, a movie that punished hormonal cravings with a violent medical disorder, and David Robert Mitchell’s It Follows, a more sobering film about when careless passivity meets vulnerability during intimacy.  Keola Racela’s Porno should be another ambitious example but, instead, it’s rather a raunchy B-movie that has more in common with Piranha 3D and Piranha 3DD – films that use the…