My cousin is messing with craiglist personals...Is that even safe?

So yesterday my cousin told me how he wanted sex bad and I non-challantly just said try craigslist and laughed. Well he did and he contacted a personals post, and he is seriously contemplating losing his virginity to it. I mean i'm not for him keeping his virginity if he wants to lose it but he's the type of person that might regret it. Anyways I was wondering if it's even safe to use the site, I'm trying to deter him from using the site for those purposes. Anybody have any experience with the site?