"I'll have a P please, Kevin."

Film On the occasion of the release of the new Spider-Man film, The Shiznit collates an oral history of superhero actors complaining about going to the toilet:

"Tom Holland, star of Spider-Man: Homecoming: "I didn't go to the bathroom for like eleven hours or something because we didn't really figure out how to take the suit off quickly at that point. And that's an expensive suit. You do not want to wet yourself in that suit." Tom Holland, star of Spider-Man: Homecoming: "I didn't go to the bathroom for like eleven hours or something because we didn't really figure out how to take the suit off quickly at that point. And that's an expensive suit. You do not want to wet yourself in that suit."

Genre television and film has rarely been very good at explaining how this works. Even having binged Star Trek for ten months, I hadn't realised there was enough to say on the subject that there's a whole Memory Alpha entry on the subject. Not to mention the bathroom on the bridge of the 1701-D.  Here's the Doctor Who version.