Fangboner (2015)

Meet Dick and Suzy. They're a couple of sluts. Dick becomes infected with an unknown virus, and in turn, infects Suzy. They soon discover that they have a new found taste for blood. The only problem with this new mutation is that they only seem to be able to suck blood, out of there victims crotches. Meanwhile, someone or something has taken notice and is out to stop them at all cost.