Need your opinion plz

Marta • Just trying to learn more about myself

So....I don’t know if this is a serious problem or not, but it’s been bothering me for a while. My bf of now 6 months keeps liking pictures of half naked girls on Instagram and it’s annoying and ive tried to put it to the side because it’s just a guy being a guy, but should I say something and if so how would I bring it up???