I have a friend who asked the same question because he knew there wouldn't be a bidet where he was going. That's the only reason I can think of that's not related to some sort of sex thing.
My insides literally shut down when I'm out in public. I don't need to poop no matter what I'm up to. The moment I get back home or to the hotel, I will wreck that bathroom, but it's like I literally cannot go in a public restroom