Sorry to put it so bluntly/crly- but why, oh why, are women castigated for masturbation?

I apologise to all those puritans that are shocked and secretly touch themselves under the cloak of night, without sin. Just very curious why it's ok, from adolescence, for boys to brag about it and girls to pretend virginal innocence- though humans be from the same ual mold. Same drives and urges, but distinctly different attitudes towards what is normal and what isn't. Isn't it time for girls to stop feeling ashamed of having natural urges? And wouldn't it be a relief for men to know we have them, all of the time? Shame begetting shame and the like. Prefer Jung, but boy wouldn't (and didn't) Freud have a heyday with the premise...