You want to give them advice? Great.
Tell them that the vast majority of rapes are carried out by someone know to the woman - a boyfriend, a friend, a husband. They don't happen in shady alleyways, they happen in people's homes. They're more at risk from the male friend who walks them home than a random stranger.
Tell them about personal boundaries. Tell them that they don't ever have to do something they're not happy with because they feel pressured to do it or because they have said yes to other things. That if a man is behaving in a way that makes them uncomfortable they can say so, loudly and clearly. They don't have to put up with behaviour that makes them uncomfortable. It's not 'making a fuss'.
Tell them that it's never their fault. Tell them that when men are lying drunk and unconscious on pavements no-one seems to think they've 'put themselves at risk' of a man shoving his penis into their anus.
Tell them to look at how they're treated by the men around them. If someone doesn't respect your right to say no to something like his hand on your shoulder or your right to be left alone at a bar it's a good indication that he won't respect you when you say no to sex.
Tell them that clothes don't matter. The same perception exists in Egypt (pre latest troubles), amongst women and men, that wearing traditional modest clothing and covering your hair reduces the risk of assault and wearing western clothing increases it. In fact it seems to make no difference to the high level of public sexual assaults. They're not about how the women behave or dress, they're about how the men behave. Women reassure themselves that they're reducing risk because no-one wants to feel powerless.