I find it quite liberating to go riding at the very early hours of the morning (between 3am or 5am) when I have diarrhea. As it allows me to focus on my riding but also gives me peace of mind that I can soil myself without being judged (always wear shorts but not white socks) and at the same time I can be confident that after a good riding session it will help empty my bowels properly so I can feel clean, fresh and relaxed the next day as by then everything should be out of my system.