The Seven-Year Old Finds Adult Motivations Mysterious

Out of nowhere:

Him: Dad, did you know there are naked ladies on YouTube?
Me (taken by surprise): What?
Him: Yeah, they just dance and stuff with no clothes on.
Me (trying to be factual): Yes. Yes, I did know that.
Him: It’s weird! Dad, Dad – why would a lady take off her clothes and dance on the camera?
Me (completely at a loss for a good answer): It’s because – maybe they need mon – no, well some men – Oh, just ask me again in five years!