Here's a news article on the subject:
https://www.nydailynews.com/entertainme ... -1.3338259
Bathroom breaks: The most overlooked part of playing a superhero

By DAN GUNDERMAN
NEW YORK DAILY NEWS |
JUL 19, 2017 | 10:52 AM
Mighty as they may be, they still have to pee!
As it turns out, even though superheroes can practically move mountains, they have trouble accessing their nether parts in costume. This could make a typically quick bathroom break into a half-hour or longer process, some stars have told E! News.

It seems no one hero has been spared by this affliction, either — and that means Superman, Batman, Spider-Man, plus the female vigilantes who keep our cinematic streets safe.
Applying the superhero garb sometimes takes hours, and it could take quite a while to remove just enough to pee, at least according to Henry Cavill, Jennifer Lawrence, Tom Holland, Christian Bale, and others.
Cavill told E! News that for his first turn as Superman ("Man of Steel"), the suit had no zipper. "So it's just one of those things where you got to wait for the right time," he said.
Ryan Reynolds, star of the surprise 2016 blockbuster "Deadpool," put it plainly. According to E!, he's said, "To pee, it took me about 30 minutes to find my penis, so it was no joke. Russ Shankles, the genius who made that suit, didn't really think of that. I let him know it in no uncertain terms."
Further, when passing the Batman torch to Ben Affleck, Christian Bale advised his fellow actor to make sure he can get out of the costume alone. "It's essential," the star told E! News. "You don't feel much like a superhero when someone else has to help you pee."
Other stars who've discussed the arduous process of peeing in costume, on the record, include: Russell Crowe (in his role as Jor-El in "Man of Steel"), Andrew Garfield (who played the lead character in "The Amazing Spider-Man" movies), Chris Evans (as Captain America in the MCU), Tom Holland (as the latest Spider-Man) and Elizabeth Banks (Rita Repulsa in "Power Rangers").
To these stars, we say: may you pee in peace.