While adulterous relationships are strictly forbidden, permissible sexual relationships within marriage are described in Islamic sources as great wells of love and closeness for the couple involved. Sexual relationship between married couples are even source of rewards from God as doing the opposite, i.e., satisfying sexual needs through illicit means, has punishment. Specific occasions (most notably daytime fasting (see sawm) and menstruation) are times forbidden for intercourse, though not for other ways of touching and being close to one another. Anal sex with one's wife is also strictly prohibited.