Should Married Couples have Single Friends

My hubby goes a little crazy when I ave m girls night out, some of my gal pals are not married and living the single life. Does this mean that I should not be friends with them? Will they be a bad influence on me? I admit they do not want to hear about the diapers and school or anything that has to do with a family life. I hear their stories and sexscapades and I am not envious t all.