I just don't understand why it is always about he girls, sometimes the boys are the ones who need protecting.
In a nutshell, because males are usually bigger and physically stronger, and males don't get pregnant. Yes, it is about self-esteem, etc., but the tradition of the "chat with her Dad" came about because girls get pregnant, and before DNA testing and modern laws to enforce support obligations, the girl was in most cases the one who suffered if it happened, unless her Dad was the one who inflicted the suffering. I'm not saying that it is right, but that's why people did it, and in the main, that is why they still do it.
My only teen child is male, and yes, we do have a lot of discussions about bad-news personalities and behaviors in girls. Right now he is spending a lot of time on the phone with a girl who is the ex of friend of his who moved out of state, and she's doing a lot of crying on his shoulder. I've overheard parts of their conversations (Skype) and it is obvious to me that she is trying to attract his interest as more than just a friend. Thankfully my DS is oblivious to that and not interested in any case out of loyalty to his friend, because that girl is an overly needy emotional train wreck.
I confess: we also have a lot of discussions about the gravity of sex that make these dating qualifications seem like a cakewalk. Given today's legal climate, we have made it very clear to DS that he should consider that every time you choose to have sex with someone that biologically might result in conception, you are taking the risk that birth control might fail and that you might end up sharing the raising of a child with that person and turning over a good chunk of the next 18 years' income to her, too. If you don't see yourself able to do that without hating her in the long run, then it probably isn't worth the immediate gratification. (Yeah, I know it's probably overkill, but it's a pretty effective deterrent in this case: because if there is one thing that DS can be counted on to be REALLY unwilling to share, it's his money.)
Also, PS for NHDisneyLover's daughter: They don't by extension think that Jews or Muslims, etc. are promiscuous and/or opportunistic or otherwise not of sound character. It is just that for the most part, folks who believe this way don't have much really solid knowledge of the theology of non-Christian religions; it usually isn't something that they know enough about to feel able to judge. IME, they are dealing from a place of personal comfort and a knowledge of their own theology, which tells them that a "good Christian" is going to refrain from breaking any of the Ten Commandments, including the ones that prohibit lying and sex out of wedlock. (And that is as far as I'm going to go down this track, lest I get into trouble.)