Heres an experience that happened to me this week.
With being busy moving and a bunch if other thi gs I accidentally bought the xl size ladies depends pullups. Didnt realize it until home but too lazy to return it so I tried one on. Definitely big (I have a slight frame) and came way up on me but I thought whatever, it will work.
Sitting at my desk at work, mid morning, had my morning coffee and water and was casually peeing as I do everyday since starting daily pullups. Not a problem, do it a the time, but all of the sudden it started feeling different. My hand shot down and the front of my pants were soaked. Luckily they were black, chino pants that dont show much but I could see the glisten as they were freshly wet. I quickly stood up and my office chair was noticeable wet as well.
What happened? Well, a combination of ladies pullups have more padding below and not in front, and Im "not well endowed" and my penis tends to stick straight out rather than point down, and the oversized pullup had shifted so my penis was covered by the top stretchy part and not the absorbant padding. I ended up peeing through the padding and right into my pants.
I sat there until my lunch break when I left the office and went to walk around and dry off. Was damp most of the day but not noticable and my chair dried.
My message - wear the size that fits!!°