Sexual morality varies greatly over time an between cultures. A society's sexual norms — standards of sexual conduct — can be linked to religious beliefs, or social and environmental conditions. Sexuality and reproduction are fundamental elements in human interaction and society worldwide. Furthermore, "sexual restrictions" is one of the universals of culture peculiar to all human societies. Accordingly, most religions have seen a need to address the question of a "proper" role for sexuality in human interactions. Different religions have different codes of sexual morality, which regulate sexual activity or assign normative values to certain sexually charged actions or thoughts.