I can appreciate house rules and the adult "child" while living there( for whatever reason) should respect them.
However there comes a time when parents need to acknowlege their "child" is a full grown consenting adult and respect that.

If they were concerned about premarital sex, they should have taken care of that in raising. Now they "cut the cord" and allow their daughter to live her life.
SC
2/3a/3b