I believe it's unthinkable for the women here in my part of China too. Heh, I'll ask around the office, see what they think.
Without meaning any offence or personal attack, the way that China culturally treats its women is historically abominable, in the contemporary world still pretty atrocious; they're still petty close to the bottom of the barrel on the majority of indices that measure rights and equalities; the idea that you would automatically ascribe a mental health issue, or substance abuse problem to a woman who is comfortable showing off her body for potential gain is itself just disgusting and offensive.
I'd happily admit to having used elements of my physical capabilities in exchange for something else I want - I don't see any shame or problem with that when the other party knows and understands the deal they're making of their own free will... and it's frankly pretty gross and ridiculous to think that someone of your mind set might automatically assume I'm a drug addict just for the presentation of that information.
Well, it's not just breasts but everything which sexually attract a man. Flashing and further sexual act is always a thing when you get gameplay benefits from it, especially when this act it's fitted in right encounters and circumstances. If you always feel asexual or some moral principles doesn't allow you to do that, you just simply don't press this dialog options.
You write as though you want this all and only exclusively available as a thing to purely heterosexual female characters, and being directed only at purely heterosexual male NPCs; no women who sleep with women, bisexuals or males of any description doing sexual things for gain in dialogue.
I know a number of men who are not attracted by breasts or any other part of female anatomy, and it has nothing to do with morality or a lack of sexual interest - Are you asking that NPCs with those preferences not exist the game?
