institutional level no relation homosociality
In sociology, heterosociality describes social relations with persons of the opposite sex or a preference for such relations, often excluding relationships of a romantic and sexual nature. The opposite of heterosociality is homosociality.
At an institutional level, the spread of heterosociality, epitomized by the entrance of women into public life/space, is closely associated with the progress of modernization.Terminology
The term heterosocial can refer to either:an individual who prefers to befriend or socialize with the opposite sex, as opposed to homosocial (preferring same-sex social relations) or bisocial (enjoying social relations with both sexes)
a social relationship between two people who are of different sexes, as opposed to homosocial (of the same sex).Whether the term can be applied to groups of three or more people has been disputed.  One possible argument is that such a group is homosocial if composed of people of a single sex, and bisocial if composed of people of both sexes, since in the latter case each member will be interacting with people of both sexes.  On the other hand, Collins English Dictionary defines heterosocial as "relating to or denoting mixed-sex social relationships", without specification of whether it applies to relationships between two people or among larger groups, suggesting that the term can describe social interactions involving people of both sexes more generally.
no relation