I have found that if there is a relationship already in existence, then adding sex to that relationship is an easy next step. I have always believed that sex between friends is better sex because you already know each other. Yes, sex with strangers is exciting and can be fulfilling, but there is a comfort that comes with having sex with someone you already know. Both of you know what the other is into, what each of you like or want, and you both care about each other. All of this adds to the sex you and a friend can have with one another. When you have sex with a friend, you already have a level of trust established. This trust allows the two of you to be more open to each other and to do more with each other. I am more apt to do anal with a friend than with a man I do not know at all, especially if the friend has a long cock. And because I know my friend better than most other people, I know that if I want him to do more ,or even stop, that he will respect my wishes. I feel that is important. I have heard some people say that having sex with a friend changes the relationship. I agree that once you open the flood gates that you can never close them again. I also agree that once you are sexual with a friend that often sex can become expected, but isn't that what friends are for?