Many religious traditions attempt to regulate the sexual practices of their members. Generally, their main tool for doing so is prescribing with whom one may or may not have intimate relations. Forbidden partners might include, for example, members of the same sex, relatives, or people of other religious and ethnic groups. Additional methods for defining how and when intimate relations are permissible are also not unheard of. For example, sexual relations using certain positions or occurring on certain days or hours or in certain places might be declared sinful. The three main Bible-related religious traditions, Judaism, Christianity, and Islam, all have in their toolboxes these various regulatory instruments; many other religious groups use them as well.