Sometimes the muscles of the pelvic floor may be overly tight/hyperactive. Many people only think weakness when they think of bladder leaking. They only think about how much they need to strengthen their muscles in order to improve the leaking issues the are having. There are some people who actually have over activity of the pelvic floor muscles, decreased coordination of these muscles and, as a result, leaking may occur. The spinchter may not be able to close completely and may allow some leaking to occur.
On a related note, some people with overactive pelvic floor muscles, or tightness in the pelvic floor muscles, may experience pelvic pain, pain with intercourse, or pain following intercourse, or pain with daily activities that may be interfering with day to day function.