I never see X10 ads anymore, so I don't think I've seen the ad you're talking about.
But... Let me guess. Since I have an idea how this kinda thing works.
They show using the cam to spy on a teen girl? I'd bet my bottom dollar scantily clad, too. Right? Let's see. If I'm a marketer and I want to appeal to the prurient interests I think (know) are the least common demoninator, but make it look "justified" in the X10's purportedly "security" kinda way, then it'd be a pool cam.