a sexual attraction to (or sexual relations with) persons of the opposite sex
同义词：heterosexualism, straightness
heterosexuality详细解释
het.er.o.sex.u.al.i.ty n.（名词）Sexual orientation to persons of the opposite sex.异性恋：对异性者的性倾向Sexual activity with another of the opposite sex.异性恋性行为：与某一位异性的性行为
