What makes some people call some questions voyeuristic while not calling others along the same line as such?

Over the years, questions such as, or alluding to:
• What color underwear are you wearing right now?
• Do you really like wearing thongs?
• If you have a skirt and no panties do you ever stand to pee?
• When you are alone are you naked or clothed?
• Why do you wear white underwear?
Some of these questions were posed by popular Flutheronians of yesteryear and it is not a complete list, there are many I have not posted. Be it a established and popular Flutheronian or someone who is gone or inactive now, those who posted in the thread commented or answered to the thread, I did not find anyone accusing the OP of some sinister motive of the OP or commenting on the question as being voyeuristic and such? Is it the OP who posted the question that makes a question on similar subjects some voyeuristic, snooping or probing question or something else? Where does the difference break from a question asking what age one started shaving body parts, even in the private area and when if ever you (if you are a woman) stood up to take a piss?