As long as he understands the rules.
1. If she cries, you cry.
2. I have 40 acres and a shovel, they'll never find you. And if they do, I'm not afraid to go back to prison.
I know there are more rules in a thread on the site, but I'm feeling a bit too lazy to find it. Maybe he would get on my good side if he did it for me.
Oh, and if he's underage, dating my daughter, and knows enough to drink good beer, I'll have mixed feelings about that.
If he's underage and drinks bad beer, then we'll have to refer to rule #2.