Sex problems

Ive recently started having sex with this guy I've been seeing, how do I tell him I like filthy hard sex? He's so gentle with me and it just doesn't get me going, I feel like he isn't the type to be so freaky like I am. I always try talking about it in a joking way, he just never seems interested in it. I don't want to have like a full sit down SERIOUS talk about it, what did youse do?!