In order to have a relationship, there are supposed to be halves coming together to make a whole. However in some circumstances, there is still a void from one of the halves. So they add on to try to get their own completeness. Some look at this as deception, lies, and cheating. Unless one has been in that situation like that they can't tell the whole story. Many people like to pity the other woman, saying that she makes herself available to a man that is not hers. However, most couples don't spend every minute of the day with their significant other. They schedule dates, plan ahead the nights they will be sleeping over. Is that not the same thing the other woman is doing with this man? Is he not spending part of his time with one female and part of it with another??? So who is to say who is his full-time lover??? Most people tend to imply that that the man is in full control of the relationship he holds with his many different lovers. Though many people would disagree ab