Why in front of me?!?!?!

Ok, sorry about the last post I'm just learnig how to use this lol! But my boyfriend of a four months has looked at his playboys & boasted about getting a new one in the mail quite a few times. I'm totally comfortable with myself and our relationship and have no problem with him looking at them. I just don't find it necessary for him to look at them or talk about them with me...it's kinda weird. I've never flat out said "Listen it gets on my nerves and I don't understand it"...but I've just been really quiet or asked if he could save it for after I'm gone. It's not like I want to look at it with him! Why does he do that in front of me?!?!?