oddly enough, my son has the same problem. Musta got it from the deep end of the gene pool.
In the Navy, we were lucky to have seats, much less stalls. do it or die.
My buddies in the Army used to refer to a portable rest room as "Hey, can I borrow your helmet for a few minutes"?

Universal solution? Zip-Lock

Been there, done that, the washing machine ate the T-shirt