In a species that reprouces sexually, sexual attraction is an attraction, usually, to other members of the same species for sexual or erotic activity. This type of attraction often occurs amongst individuals of a sexually-reproducing species, although in many species it serves no immediate reproductive goal – indeed, some sexual behavior among primates is undertaken as a social activity. Certain aspects of what is sexually attractive to humans may differ amongst particular cultures or regions. Influencing factors may be determined more locally among sub-cultures, across sexual fields, or simply by the preferences of the individual. These preferences come about as a result of a complex variety of genetic, psychological, and cultural factors. The sexual attraction of one person to another depends on both people.