I posted this in response to someone in the "Why do you post on MDB" thread, but it really belongs here. Comments are welcome:
Actually, the LDS Church and the Jewish Church have very similar rules about sex. I just found a very interesting article about the Jewish views regarding sex. Read the portion about sex and women, in particular. I wish that our Church spelled things out this plainly.
Jewish Attitudes Towards Sexuality
In Jewish law, sex is not considered shameful, sinful or obscene. Sex is not thought of as a necessary evil for the sole purpose of procreation. Although sexual desire comes from the yetzer ra (the evil impulse), it is no more evil than hunger or thirst, which also come from the yetzer ra. Like hunger, thirst or other basic instincts, sexual desire must be controlled and channeled, satisfied at the proper time, place and manner. But when sexual desire is satisfied between a husband and wife at the proper time, out of mutual love and desire, sex is a mitzvah.
Sex is permissible only within the context of a marriage. In Judaism, sex is not merely a way of experiencing physical pleasure. It is an act of immense significance, which requires commitment and responsibility. The requirement of marriage before sex ensures that sense of commitment and responsibility. Jewish law also forbids sexual contact short of intercourse outside of the context of marriage, recognizing that such contact will inevitably lead to intercourse.
The primary purpose of sex is to reinforce the loving marital bond between husband and wife. The first and foremost purpose of marriage is companionship, and sexual relations play an important role. Procreation is also a reason for sex, but it is not the only reason. Sex between husband and wife is permitted (even recommended) at times when conception is impossible, such as when the woman is pregnant, after menopause, or when the woman is using a permissible form of contraception.
In the Torah, the word used for sex between husband and wife comes from the root Yod-Dalet-Ayin, meaning "to know," which vividly illustrates that proper Jewish sexuality involves both the heart and mind, not merely the body.
Nevertheless, Judaism does not ignore the physical component of sexuality. The need for physical compatibility between husband and wife is recognized in Jewish law. A Jewish couple must meet at least once before the marriage, and if either prospective spouse finds the other physically repulsive, the marriage is forbidden.
Sex should only be experienced in a time of joy. Sex for selfish personal satisfaction, without regard for the partner's pleasure, is wrong and evil. A man may never force his wife to have sex. A couple may not have sexual relations while drunk or quarreling. Sex may never be used as a weapon against a spouse, either by depriving the spouse of sex or by compelling it. It is a serious offense to use sex (or lack thereof) to punish or manipulate a spouse.
Sex is the woman's right, not the man's. A man has a duty to give his wife sex regularly and to ensure that sex is pleasurable for her. He is also obligated to watch for signs that his wife wants sex, and to offer it to her without her asking for it. The woman's right to sexual intercourse is referred to as onah, and it is one of a wife's three basic rights (the others are food and clothing), which a husband may not reduce. The Talmud specifies both the quantity and quality of sex that a man must give his wife. It specifies the frequency of sexual obligation based on the husband's occupation, although this obligation can be modified in the ketubah (marriage contract). A man may not take a vow to abstain from sex for an extended period of time, and may not take a journey for an extended period of time, because that would deprive his wife of sexual relations. In addition, a husband's consistent refusal to engage in sexual relations is grounds for compelling a man to divorce his wife, even if the couple has already fulfilled the halakhic obligation to procreate.
Although sex is the woman's right, she does not have absolute discretion to withhold it from her husband. A woman may not withhold sex from her husband as a form of punishment, and if she does, the husband may divorce her without paying the substantial divorce settlement provided for in the ketubah.
Although some sources take a more narrow view, the general view of halakhah is that any sexual act that does not involve sh'chatat zerah (destruction of seed, that is, ejaculation outside the vagina) is permissible. As one passage in the Talmud states, "a man may do whatever he pleases with his wife." (Nedarim 20b) In fact, there are passages in the Talmud that encourage foreplay to arouse the woman. (Nedarim 20a). Any stories you may have heard about Jewish sex occurring through a hole in a sheet are purely an urban legend.
These are the Jewish views on masturbation:
Jewish law clearly prohibits male masturbation. This law is derived from the story of Onan (Gen. 38:8-10), who practiced coitus interruptus as a means of birth control to avoid fathering a child for his deceased brother. G-d killed Onan for this sin. Although Onan's act was not truly masturbation, Jewish law takes a very broad view of the acts prohibited by this passage, and forbids any act of ha-sh'cha'tat zerah (destruction of the seed), that is, ejaculation outside of the vagina. In fact, the prohibition is so strict that one passage in the Talmud states, "in the case of a man, the hand that reaches below the navel should be chopped off." (Niddah 13a)
The issue is somewhat less clear for women. Obviously, spilling the seed is not going to happen in female masturbation, and there is no explicit Torah prohibition against female masturbation. Nevertheless, Judaism generally frowns upon female masturbation as "impure thoughts."
http://www.jewfaq.org/sex.htm