[Eternal]

Originally Posted by Boobies

You're overreacting, unless the photos are illegal. Men love naked women, it's a fact of life.

While this is true, it doesn't justify the fact that he shows off woman other than his girlfriend to his "boys."
I think you need to have a serious talk with him about why you don't feel comfortable with him having pictures of old flames on his phone. If he still refuses to remove the pictures, then it doesn't seem like he respects you. It is your decision whether to stay with him or move on to someone who won't want pictures of other girls on his phone, but I do think you should take into account whether he seems loyal or not. I'm not saying loyal as in whether he is cheating on you or not, but whether he is loyal to the relationship and is content being in it. Having pictures of other girls sounds like he may not be satisfied with being in a serious relationship.
Communication is very important, so that is my best advice to you. Express how you feel to him, and see if he cares to listen and delete the pictures.