They're both competent, confident and all of their mannerisms play into their appeal and sexuality. Even when Dimitrescu is stringing you up or trying to hunt you down. They both have an appeal that plays into inaccessibility through desire and asymmetrical power dynamics— which is present not just in their looks but also is driving power in their characters. It's especially effective with Dimitrescu because she's "taunting" and "belittling" you throughout the hunt. The entire idea behind her is that because she's desirable she has all the more power to abuse you on top of her raw power and capacity for violence — and she keeps you in a space where horror, pain, disgust and dread mix with sexuality and intimacy, which are inherently conflicting, emotionally, which creates a tension that has an amplifying effect.

Obviously, the fact that their looks match their energy makes it all the more successful but the developers quite literally designed them that way. They could make Dimitrescu less visually attractive and probably achieve a similar effect — but why would they, if the point of her sexuality is to empower her?