It sounds like you are wondering what to tell her about sex rather than what to tell her about boys. It's probably best if her mother were the one to tell her about the birds and the bees. As far as boys go, you can't tell her anything that applies to EVERY SINGLE MALE out there. We're all different, and contrary to popularly-held opinion, not all boys/men are pieces of shit with one thing in mind, a thing that they will stop at absolutely nothing to get.
Your only real hope is that you have raised her and will continue to raise her in such a manner that she acquires all the necessary "life tools" to deal with those men she may come across who ARE scumbags. Because she will come across some. But if she has been raised right, she is self-confident, intelligent, etc etc, she most likely won't be attracted to the type of guy who will habitually treat her like shit. I assume this is the kind of guy you want her to avoid. And if she is, believe me, her father voicing opposition to the men she dates isn't going to steer her away from them.
The flip side of that coin is that if she IS self-confident, intelligent, has a sense of self rather than a need to define herself through who she dates and so forth, then she will also reject your advice about men to a certain extent. She will be smart enough to know, maybe just subconsciously at first, that she needs to find out for herself what the male animal is all about. You can't decide for her what sort of guy she dates and you can't start at an early to indoctrinate her about men in the hopes that she will be attracted to the sort of men YOU want her to be attracted to. She'll pick up on that, even if she can't quite explain what it is she's picking up on.
It's a leap of faith. Parenting in general is a series of leaps of faith. You can't control everything about her; you can only hope that your parenting has prepared her in such a way that she does not become an easy target for guys looking for a cum dumpster. Puberty and the requisite exposure to the opposite sex is one of these leaps of faith. When she starts high school is another, as is college, letting her go out at night with friends to places where drinking and/or drug use may be taking place is another, her first serious boyfriend that she likes and you don't is another one. There's a lot.