Okay, to be fair, the dhampir ritual has no naked dancing, but it has Harry drinking a litre of Corvin’s blood and that’s just gross. It won’t be a big deal when he already is a dhampir, but doing it while still human? Disgusting. At least there isn’t much more to it after that. Drink some blood, bathe in moonlight, a rambling, chanting spell and some wand-waving, and Harry gets knocked the fuck out.