He grabs my hip bone

I’ve been seeing a guy who’s older than me. I’m a virgin and we haven’t been intimate. But every time we cuddle he sporadically grabs my hip bone gently but firmly. It’s almost as if he’s testing it out lol. It doesn’t bother me, I actually like it. I’m just genuinely curious if that’s his thing or guys do this because they are imagining and thinking about other stuff lol. He’s a pretty buff guy with big hands so it makes me feel small when he does it. Anyway I’m just genuinely curious about this. What do you think?