Most People Don't Care
I can't speak for everyone, but most people I know who live in NYC (including myself) don't really care - we just ignore anyone outside the windows. Sex on the living room couch, or against the window sill in the big bay windows (with the more adventurous girls), walking around naked, etc. is all fairly par for the course. I did get a chastising finger wave from one of the older women across the street from me once; not sure what her problem was.
As a side note, looking in people's windows is not illegal in NYC, as long as you are not using any cameras, etc. (not sure about binos).
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