Is it normal to get aroused seeing women use the toilet?

Ah well, i think it's not usual, but still a "normal" sexual fetish/perversion.

A friend of mine confided to me that her boyfriend wants to watch her use the toilet, which she found weird/perverted, later he also wanted her to pee on him in the bathtub. She went along with both things because she loved him, but she definitely wasn't thrilled.

Also, when i was around 17, mine and a friends family went mountaineering together. We all split up a bit, meeting up regulary. When i had to go, i went to some bushes a bit away, when i saw that my friends little brother was sneaking along. At first i was just like, "ok, he also needs to go", and didn't think much of it, because he wasn't in a place to "watch" what i did. So i did my thing and went back, and my friend asked if i saw her brother...which wasn't back even a few minutes after i was. So i went to take a look where we had been and found him in the exact spot i did business in, jerking off. I laughed, to which he shockingly realized he was not alone, then told him to finish up because we're waiting, turned around and went back to my friend. He came 3 minutes later with a blazing red head and avoided talking with me for the rest of the day. Good times. Long story short: Yeah, it seems more people have such fetishes...