Over the years, especially when I was younger, I have demonstrated my uncut cock for girls who had never seen a foreskin up close before. That often involved my masturbating for them, though mostly they would want to touch it... and that led to more.
Once in college a girl friend had told a bunch of her girl friends about my penis being really big and uncircumcised. She had me strip and masturbate for 6 or 7 girls one night in one girls room, them all sitting around me and me naked on a desk chair.. I was in very good shape and felt great. They cheered me on and really applauded when I shot big spurts of sperm all over my chest and belly... What was even better is that my girl friend kind of strutted over to me and proudly kissed me and then licked my cum off. They applauded that too.