@Jeff, let me be clear. Your response is entirely insufficient in my eyes.
Further to that, i suspect it is damaging.
So your attempt to help is, tell men they are useless and don't deserve to have a girlfriend, because they are not 'a capable adult';
And further you add the threat, 'beating within an inch of his life' (i would note that the threat of losing your career and fame as a footballer was not enough to stop the recent famous case in england - so these sorts of threats, don't work.)
Basically completely failing to address my question, what do you tell them TO DO.
Lastly, you as a father don't own your daughter, and shouldn't be acting like she's a piece of meat to be despoiled. She should have sex with whomever she wants (or on her own) as often as she wants. And acting like this is 10,000 years ago, and your little daughter can be traded with your neighbour as breeding stock - but only if she hasn't touched another man, so he isn't cuckooed - if frankly disgusting to me.
@KC: i can accept that we disagree on legislating for these issues; and i would go so far as to say that expecting a legal system to handle it may be dis-empowering for humans; that it may discourage them from taking responsibility for themselves to educate their children and model positive behaviours.
But we do live in a society where we compromise and accept that legal system are in place to protect us from encounters with strangers, by taking vigilante justice (of the kind Jeff Kuta seems to advocate) out of our hands and into state hands. This is different from traditional cultures where you rarely encountered strangers, and most people you knew would be life long neighbours.
I don't think we can exist as a modern society without these kinds of rules. I just believe that these rules are insufficient. So i suspect that i'm in agreement with you at least that "men and women need to be activists in their communities". As it happens, i'm watching an related discussion on a lot of issues with Jarred Diamond on youtube. Which does include a lot of things about justice and traditional value (if you're interested: https://www.youtube.com/watch?v=ceLuaf7low4 )