Glass-walled bathrooms, open bathrooms, and so-called "peek-a-boo" bathrooms—where there's an open window between the bathroom and the rest of the room—are increasingly popular, especially at hotels geared toward couples. The name certainly sounds sexy, and there's nothing wrong with wanting to give your guy a peek while you're in the bath or shower. But here's the rub: You may end up sharing more than you'd planned. If there's an opening between the bathroom and the room—well, let's put it this way: noise carries. And in some glass-walled bathrooms, like those at the Standard Downtown in LA, it's possible to see your guy on the toilet (and vice versa).
If you're already comfortable peeing with the door open, this may not present an issue for you, but if you're still at the phase where you'd like to preserve a little mystery, you might prefer a bathroom with solid walls. Or at least a privacy screen.