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Behavior patterns are generally unwritten and constantly changing.There are considerable differences between social and personal values.Thus, the concept of marriage is changing widely in many countries.

As humans societies have evolved from hunter-gatherers into civilized societies, there have been substantial changes in relations between men and women, with perhaps one of a few remaining biological constants being that both adult women and men must have sexual intercourse for human procreation to happen.

Humans have been compared to other species in terms of sexual behavior.

These people will have dates on a regular basis, and they may or may not be having sexual relations.

This period of courtship is sometimes seen as a precursor to engagement.

Dating as an institution is a relatively recent phenomenon which has mainly emerged in the last few centuries.

From the standpoint of anthropology and sociology, dating is linked with other institutions such as marriage and the family which have also been changing rapidly and which have been subject to many forces, including advances in technology and medicine.

Accordingly, there was little need for a temporary trial period such as dating before a permanent community-recognized union was formed between a man and a woman.

While pair-bonds of varying forms were recognized by most societies as acceptable social arrangements, marriage was reserved for heterosexual pairings and had a transactional nature, where wives were in many cases a form of property being exchanged between father and husband, and who would have to serve the function of reproduction.

New types of relationships formed; it was possible for people to live together without marrying and without children.

Information about human sexuality grew, and with it an acceptance of all types of sexual orientations is becoming more common.

Neurobiologist Robert Sapolsky constructed a reproductive spectrum with opposite poles being tournament species, in which males compete fiercely for reproductive privileges with females, and pair bond arrangements, in which a male and female will bond for life.