Hmm, it has a mix of both answers. Curiosity is one thing but if the reason you happen to be watching porn is BECAUSE your spouse is not giving you the kind of attention you need then that's when you must speak to him or her about how you feel. Other than that feel free to watch all the porn in the world, maybe even with your spouse if that's what it takes to set a mood or just plain taking notes for future references. Whatever those references may be.