That poor Faunus has probably heard her parents power fucking throughout her entire childhood.

Contraception? in a Grimm infested world where numerical superiority is the only way to keep extinction from becoming a reality? we assume that families like Jaune's are the odd ones out because most of the families we've seen had one to three children max. That is not true. Those families are the odd ones. the larger the family the more chance that it as well as the children of that family would live long enough to build their own families. For warrior families like Jaune's a larger family means more chances that the soldiers that they produce would survive conflict. even normal families along the frontier would have more children encase Grimm come.