In sociology, homosociality means same-sex relationships that are not of a romantic or sexual nature, such as friendship, mentorship, or others. The opposite of homosocial is heterosocial, preferring non-sexual relations with the opposite sex. In group relations involving more than two individuals, the relation can be either homosocial (involving same-sex social relations), bisocial involving social relation with both sexes or heterosocial involving only opposite sex.