Earlier quoted context omitted.
I don't think there can be a rigid distinction between "I don't want to see that" and "actual harm". We can presumably agree that it would be wrong if Google put up posters of naked women all over the office, and that the EEOC is right to prohibit such things as a hostile work environment. But what "actual harm" could you point to beyond the fact that the posters are offensive and people don't want to see them? I und…
The harm in your example is that by putting up these posters of naked women being valued only for their body, you send the message that that is how women are seen here. A woman is likely to feel she is at risk of being objectified the same as the women you've put on the wall as literal objects. I'm confused what the analogous harm is to you when two adults have consensual sex behind closed doors where you can't see o…
The argument that women will interpret the posters as a message that they are seen as objects is potentially interesting, but then what about all the women who work at modelling agencies and ad agencies and actual sex related businesses?
The argument that women will feel threatened because the posters will cause the men to attack them, or even just low level menace them, is saying that men are helpless reacting animals and are not responsible for their actions, which is the same argument as saying women are responsible for rape by not dressing badly enough.
These theoretical posters are simply and merely inappropriate for facililitating the work being done in most workplaces. They are unwelcome but it's merely because they are a distraction and an annoyance. It doesn't cause any sort of harm that can justify any legal consequences.
There is no argument for making them illegal, and in fact they're already not because there are tons of businesses where such images are central to the business. The same image will be interpreted as porn in one room while it's just the businesses product on the wall at countless clothing manufacturers. So the image itself can not be said to posess any intrinsic harm or evil.