Succubus and Incubus

An incubus (no not the ghay band) and succubus admiring each other with a smirk. I wonder about this scenario a lot. If both of them have the ability to drain life force through sex then if they had sex with each other would they neutralize each other and thus have "normal" sex? If this is true than happy day for Rogue of the X-men. She can finally have sex, she'll just need a Necronomicon and some incense. Poor Gambit