Jewish Sexuality dot Com

Question:

Does Tikun HaBrit (sexual purity) apply to women also?

Answer:

Absolutely. While a woman does not have the same physical stamp of the brit (circumcision) as a Jewish man, she must also carefully strive to live a life of sexual purity in accordance with the guidelines of our Sages. Just as with a man, she has an anatomical counterpart to the spiritual sefirah of the "yesod." If she blemishes this through sexual transgression, she damages the spiritual channel that brings blessing to her and to the Jewish Nation as a whole, as we have explained in the beginning chapters of the book, "Secret of the Brit."

A mikvah (ritual bath) where women immerse following their menstrual cycle

Women who act in an overly seductive fashion, even with their husbands, may be transgressing the Torah prohibition not to put a stumbling block in front of a blind man.

The Torah calls upon women, as well as men, to "Be holy!" This means not only to separate from forbidden sexual practices, but also to sanctify one's behavior in things that are permitted. Marital relations should be conducted in a joyous, loving fashion, but care should be taken to follow the injunctions of our Sages, which stress modesty, including having relations in the dark only, preferably on Shabbat evening after midnight, and with the man on top facing the woman who lies on her back, facing up. The laws surrounding marital relations are many and should be studied like every other aspect of the Torah. This answer to the above question is a very condensed overview, and is not meant as an all-encompassing response. 

While women do not have the same seminal seed as a man, the Kabbalist elder, Rabbi Eliahu Leon Levi, stresses that women have "feminine waters" that must not be wasted. Thus, masturbation is also forbidden to women, for this reason, as well as for the lack of sanctity and purity of thought involved in the act.

Women must also be careful not to do things that improperly prevent fertility, like abortion or improper contraception. 

A woman is also called upon to guard her eyes from seeing forbidding things, like pornography on the Internet. Note that it is improper for her to see her husband sexual organ. Since the mouth is spiritually connected with the "yesod," a woman must also be careful to speak in a proper fashion and not to blemish the spiritual channel of the "yesod" by speaking lashon hara.

Because sexual purity is the foundation of the Jewish Nation, a woman should endeavor to study and periodically to review the many laws and fences enacted by the Rabbis regarding these vital matters, and not rely on the learning she did before her wedding.  Sexual wrongdoing and mistakes must be rectified though t'shuva.