Musar zu Bereschit 34:1

ותצא דינה בת לאה . The lesson we learn from this incident is how careful women have to be to conduct their affairs as far as possible within the privacy of the home. This rule does not only apply to married women but also to unmarried girls. If Dinah, a daughter of such illustrious parents as Jacob and Leah, was not safe from an attack on her virginity, daughters of less illustrious parents certainly need to be guarded carefully.