Conservative Judaism, while generally encouraging its members to follow the traditional Jewish views on birth control has been more willing to allow greater exceptions regarding its use to fit better within modern society. Reform Judaism has generally been the most liberal with regard to birth control allowing individual followers to use their own judgment in what, if any, birth control methods they might wish to employ. Jews who follow "halakha" based on the Talmudic tradition of law will not have sex during the 11–14 days after a woman begins menstruating. This precludes them from utilizing some forms of "natural birth control" such as the "Calendar-based contraceptive methods" which are relatively unobjectionable to other religious groups.