I'm very protective of my younger sister, but you'd be stupid to call me over protective.
I do however have high expectations for her and I let her know this all the time. I tell her to watch her back, and not to put up with guys who waste her time and treat her like shyt. I do know the difference between a guy being hard to get and a guy being a jerk, and I teach my sister to know the difference too. Any time I see a guy trying to run game on her, I let her know, and she's very privy to the games men play - even the coy games of a Don Juan or PUA. Before you guys get mad, and say that I'm ruining your chances with her - if a girl really likes you, then she'll let you run game on her even if she knows your doin it. I want her to use discretion when choosing guys, and I teach her to be picky. I tell her that her friends are sluts, and I'm glad she's not like them (and she's since switched friends). She's a very attractive girl, and she can afford to turn most guys down.
If I see a guy I don't like hitting on her, then I will simply 'poison the well' so to speak. I don't have to tell her not to hang around him, just make it plain that I don't like him for whatever reason - maybe he's rude to me, or he seems shifty, or he clearly is just trying to fvck my sister. Either way, he can rest assured that he'll be c0ckblocked by the guy my sister admires most - me.
If I like the guy - and I can like a guy for many reasons, one of which does not include him being an AFC wuss - I will simply stay out, be friendly to him if he comes around, and ask her about him as if I was just curious about whats going on so that she can tell, at least, that I don't dislike him.
You see, my little sister is a virgin.
There are a lot of sluts in this world, and I don't mind fvcking a slut, but I don't make a habit of sleeping with virgins. I respect a woman's purity very much, but she has to first respect it herself.
I am in no way hypocritical by looking out for my sister, and encouraging her to think twice before becoming another ho. The world has enough slvts.
Hell, I spend every day looking for a good looking girl who isn't a vain attention wh0re or total slut. I'm damn proud that my sister is neither of these, especially since she often tells people "I wouldn't be who I am today if not for my older brother."
If you don't understand that, then you and I are very different people.