@koisemia As for the little brother asking, if he knows about sex-ed, and your family is good with it, you could be straight up about it (Depending on age) Otherwise cuddling or "they are wrestling" could be solid answers to the question.
@koisemia In horror depending on which kind of movie and who the killer is in it, the intimate scene will be used as "example of lust here" and the consequences of it with usually both dying after or even during that point. Cont.