Please excuse me writing in English.
One of my favourite activities in bed is stretching my partner open, and if she is relaxed enough and big enough, inserting four fingers and even sometimes my whole hand into her vagina. My experience is that any woman who has had a child can take a whole hand. Of course its important to use lots and lots of lubricant, and stretch gently as she relaxes. Many women have really huge and long lasting orgasms when you do this, especially if you can reach their cervix, and move it about. Does anyone else enjoy this activity?