I don't think its a crime to quench the thirst of an unsatisfied woman given than she is ready to share herself with you .
I am quite lucky to have such experience. About a year ago, a family was living on rent in my home, consisting of couple with a son of about 5 years. Her husband worked at distant place and would only return home on weekends.
I noticed some disputes between them many times. Later, I was convinced that she must be sexually unsatisfied as she always talk rudely with him. She would dominate him and he would do only what he is told.
Looking at these circumstances, one night when her husband was outside for work, I rushed to her room which was on 2nd floor and entered her room. My heart seemed to pop out. I was just standing there and looking for her to proceed. She was looking marvellous, typical mid aged woman with her large boobs clearly visible in her night wear.
I lost my control and started pressing her breasts and we fell to the floor. I started to uncover her clothes. After all the dirty work I ended with being sinful. We continued this for 2 months or so. Sometimes, I would satisfy her as well . But my family got to suspect our activities.
Later on she with her family were told to leave our house for some odd reason. She was scolded for all such wrongdoing with me. That day I was feeling very guilty ,even to make eye contact with my family .
Luckily after a month I got admitted to an engineering college ,thus its all happen that rest in my memory . Some time i would thought about the incident but feel guilty.
I think that if both of you are agree then its not harmful to indulge in such relationship.