Marriage is also a means whereby society attempts to distribute wealth in an orderly manner. There are many logical reasons to have sexual laws. The majority of these laws relate to the elimination of chaos and conflict in a society. However, the fact remains that sexual attraction is neither logical nor intellectual. Sex between human beings is a highly emotionally charged experience.
Few humans come together simply to produce children.
Humans come together sexually as a result of emotional needs and biological drives. Sex is one of the strongest human impulses. Sex has little to do with logic. When the attraction is great enough between humans, no potential sacrifice of status or power or the incurring of social prejudice or criminal punishment can deter it. In addition, a person's sexual preference generally has little to do with his or her overall contributions to society.