I have this really good friend who I have known since I was about eight years old. This friend is a woman. She has a boyfriend whom she is engaged to, and I have a girlfriend whom I have been seeing for two years. We often hang out together, go to the movies, go to bars, parties, etc. The one thing we both enjoy with each other is sex. We are not romantically involved, however. We just really enjoy having sex. It satisfies both of us and we have decided to do this even after she gets married. Just really good friends having really good sex.