An odd thing about parenthood is how your own relationships change. From your wife, to your own parents, your friends and even potential new friends everything is seen through a new lens. I used to choose my friends because I liked them, now I consider how they will affect my child... do they have children? do they parent the way I do? do they have similar views morally? These and a myriad of other questions come to mind when I meet a new potential friend now.
You may think you could have friends that you just don't want around your child, but is that really possible? Is a person truly a "friend" if you can't invite them into your home or enjoy spending time with them around your family (and have them enjoy it as well)? I know I used to think that was possible, but upon further reflection I've changed my mind. My life is not complete without my family and I don't think I could maintain a friendship with someone I couldn't have around my child, not any sooner than I could be friendly with someone who didn't like my wife. We are a package, take us or leave us but we roll together... I thank my parents for setting that example when I was a child and a friend for reminding me.