One of the biggest differences is that when you are single you can go out with your friends and do anything that you want to do and no one has to know about it but you. When you are married you can not go out like that because you have to tell your wife what you did so she will not get mad at you for something that you did that night. If you are single you can stay out all night and come home the next morning if you want to. When you are married if you stay out later than you tell your wife you are going to she will be out looking for you and calling all of your friends to see if they know where you are.