I don't really view breasts as "intimate parts", so my reaction upon being flashed, would probably just be "yes, those are very nice, but the price is still ..." Surprisingly, random flashing has never been a thing in any of the games I've run or played, even the really adult ones, probably because casual nudity means that exposed breasts are not shocking or unusual.
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.
