Boyfriend doesn’t get my suggestive comments

I’ve often wanted to tease or flirt with my boyfriend about things I’ve planned.

Eg I’ve said ‘oh I went to bras and things and I got some...things!’ And he just didn’t register what I’m referring to...

It’s not like we haven’t been intimate or like he’s young or anything (he’s 23) but I don’t know why he does understand or react to my suggestive comments....

Any thoughts? We’ve been together 4 months.