There are plenty of threads on here about VS, and its lack of basic vetting processes for its ads.
The important thing is not to get suckered-in by the photos, which are almost always B&S. As advised above, do your research by searching the pictures, to see where else they are used (it is highly unlikely that a Japanese porn model is advertising on VS, or that the same girl is simultaneously working in umpteen places around the country, for example). And search the phone number, to see where else it pops up (if the same number appears in ads for different girls, for example).
If someone is only advertising on VS, then you should also be asking yourself why.