Kids, there's no such thing as an opposite gender or sex. That belief is fucking toxic.
The phrases imply there are only two genders and only two sexes. That's very very very very wrong - take it from me, a nonbinary kid who doesn't identify as fully a girl or a boy.
'Cause look, there are boys and there are girls. Most people are like that. But you can also be neither a boy nor a girl. Or you can be a little of both. Or something else entirely. There aren't just two genders and being nonbinary is probably a little more common than you think.