I'm alittle late to the thread so sorry I didn't read all the responses.
Personally I think the officer was giving sound advice. As Scottie said the wording "Slut" might not have been the best choice of words. Maybe the officer could have said "You are less likely to be raped if you don't dress in very revealing clothing".
Honestly the less attractive you look the less likely you are to be raped. I don't need facts to back that up its basic human instincts.
Is someone going to rape you soully because you have a cute face, maybe. But are they going to choose a fully clothed girl with a cute face over a girl dressed provocatively who is also just as sexually attractive.
Also while I have no concrete facts to back it up. The majority of rapes and murders I hear about are women who are prostitutes. Now this might be rapists and murderers targetting sex industry workers. But it could in many cases also be because of how those women are dressed walking around town. They make very conveniant targets.
Also alot of rapes occur on beaches, at least from what I have read in the news. Why so many beach goers get date raped or raped on the beach I could say might be related to the lack of clothing.
Also date rapes in bars. The guy isn't likely to drop a roofie in a fully clothed girl's drink when he can put it in a girl with much more revealing clothes drink. Fact is men are highly attracted to the female body. The more it is covered the less they are attracted. The less men are attracted the less likely they are to rape a woman.
Same goes for sexual harrasment. I've known both attractive girls and non-attractive girls. The attractive girls who dress provactively are always complaining about getting their butt slapped or getting a rude comment. The girls who tend to wear less revealing clothes or who are less attractive complain the opposite that they never get guys attention and that no guys hit on them.
Now I could tell all my female friends, show more skin and more guys will hit on you. But I'd probably get slapped upside the head and loose alot of respect. But its a fact.
As such I think this Police officer was given sound advice, based on his own experiances and the knowledge he has built over the years of being on the police force. Also if he was talking to kids about rape chances are he is an officer who investigates rape crimes as usually specialists talk at schools. Meaning he probably had alot of experiance that gave him his belief and that belief while may not sound the best is probably closer to reality then the more politically correct belief that what girls wear doesn't affect their chances of being sexually abused!