Aside from my urinary leakage, I have often found when sitting on the toilet seat and urinating at the same time, that the angle of the stream is such that it gets under the seat and flows out to the floor. Its not only the mess I need to clean up but wet socks and pants,
I initially found that sitting well forward usually works , but its so easy to forget when you're concentrating on stooling.
I no longer sit on the seat but on the ceramic bowl itself. Its not really uncomfortable and i haven't had an accident since.