From the original Operators, the samurai
Basically, don't sit with your pants around your ankles, because getting caught on the can is a REAL bad spot, and it's even worse if your legs are tied together. The technique of picking your one leg up completely out of your pants/shorts/whatever doesn't work too well unless you have very loose legs or easily removed shoes. The site, being aimed primarily at men, only mentions the usual deed for which men sit on the can, but presumably technique might work for women? I don't know how those particular parts work as I haven't got them.