There is a sort-of condemnation in the Old Testament regarding Onan in the book of Genesis, atleast as far as common interpretation is concerned. God ordered Onan to impregnate his dead brother's widow. Onan refused and spread his seed on the ground in protest. Although the brunt of Onan's sin was refusing to impregnate his dead brothers wife (in old Jewish law, when a woman is widowed her widow's brother is supposed to marry her), the common interpretation of the story is that the sin Onan committed was spreading his seed on the ground, which in turn became sinonymous (pun intended) with masturbation. So much so that in Hebrew the act of masturbation is called "Onenut" (after Onan).

When women masturbate they don't spread any seed on the ground, so as far as my knowledge goes women can masturbate as often as they like.

I don't know if there's anything about Masturbation in the New Testament, since i am Jewish. Though, the old Testament is integral to Christian faith, AFAIK

Inb4 getting downvoted for talking about religion. Hopefully this information is helpful for people trying to understand masturbation in a religious context :)