I don't remember any girl I knew when I was young saying masturbation was disgusting. I think this is probably an American thing, Americans seem to be very prudish. Or perhaps it's a generational thing. Maybe young people nowadays have more sexual hangups than they did when I was young, I don't know.
Honestly, all that stuff about 'women aren't supposed to enjoy sex' that was a Victorian thing, nobody has believed that for decades surely?