friends with benefits?

Klaske
Theres this guy I know from school. We didnt really know each other but last week there was a party and he started to flirt with me. We've been talking since and he's been really sexual in conversations. I asked him what he wanted and he told me he wanted to be friends with benefits. 
Does someone have experience with this and is it a bad idea? He told me it would probably never turn into a relationship. I dont know what i should do, because it sounds quite fun to me but maybe ill get hurt..