What men normally talk about when they gather up?

Summer

Me and my boyfriend have sex 3-4 times a week and always in his room (he is living with his parents).

So today my boyfriend posted a picture of him with his gang in his room and one of the comments were saying: “I bet that room smells like fast food and sex!”

I really wonder if my boyfriend does discuss about our sex life with his gang or not? I am kinda bugging about that. Should I confront him and tell him that I don’t like it?