My experience is that for the woman, it is the most intense sexual experience that they can have. The sensation of being "full", with every vaginal nerve ending being stimulated at the same time. The orgasms come in waves almost to the point of convulsing. The fister then can add the movements of in and out or twisting to make the experience that much more. But the key is to relax when starting. The mental block of a hand can be difficult to accept. But remember that a vagina is designed to stretch out enough to allow a baby to come out and that is much bigger than even my hand. Lots of lube and patience are the keys - along with thorough inspection for hangnails!  Besides, if all these rail thin 18 and 19 year old Czech and Hungarian girls in porn can do it....

Fred Fister