The views of religions and religious believers range widely, from giving sex and sexuality a rather negative connotation to believing that sex is the highest expression of the divine. Some religions distinguish between sexual activities that are practised for biological reproduction sometimes allowed only when in formal marital status and at a certain age and those practised only for sexual pleasure in evaluating relative morality. Sexual morality has varied greatly over time and between cultures. A society's sexual norms —standards of sexual conduct—can be linked to religious beliefs, or social and environmental conditions, or all of these.