Heterosociality describes social relations with persons of the opposite sex or preference for such relations, often excluding relationships of a romantic or sexual nature. The opposite is homosociality

Homosociality

In sociology, homosociality describes 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...

, preferring relations of those with the same sex. Unlike homosociality, due to the nature, heterosociality can only be used to describe individuals or individual relations. A group of more than two individuals must be either homosocial

Homosocial

In sociology, homosociality describes 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...

 or bisocial, otherwise the group would be divided with areas of non-interactiveness.