Do you think a parent show advise his daughter to do so?
It depends. I got married at 21 years old. We didn't live together before marriage, and that marriage lasted less than 3 years.
I lived with my second husband almost two years before we got married, because I had no desire to get married again so soon. We have now been married over 16 years.
Really, we are not talking about a 16 year old in the back seat of a car. She is 29 years old.
Do you really think that she was going to stay a virgin until 29 years old, whether she lived with him or not?