We do not know exactly currently what Chuck does to women, but it is really BAD! Dalia is truly afraid of Chuck and she is not the only one. Sophia Lundgren, who is amoral and dangerous in her own right, finds Chuck scary. And going by the info we already got from the story so far and the implications of Sophia and chuck´s last conversation, Chuck at least maims them for life, but it is also very possible that he kills them.What does Dr Chuck do to women? I kind of liked him but the conversation with Sophia Lundgren was a bit unsettling though I'm not clear on what's implied.
Remember, Chuck is visibly sad that he, should he ever win against Sophia at Chess, cannot even leave any lasting damage to her, since she is far too useful.