Anorexia is often enough fatal, too.

"MORTALITY RATES

Eating disorders have the highest mortality rate of any mental illness
A study by the National Association of Anorexia Nervosa and Associated Disorders reported that 5 – 10% of anorexics die within 10 years after contracting the disease; 18-20% of anorexics will be dead after 20 years and only 30 – 40% ever fully recover
The mortality rate associated with anorexia nervosa is 12 times higher than the death rate of ALL causes of death for females 15 – 24 years old.
20% of people suffering from anorexia will prematurely die from complications related to their eating disorder, including suicide and heart problems"

Eating Disorder Statistics

So if you face that statistical risk, and you have already stopped eating, and you fit into children's clothing and YET call yourself a fat cow (a typical symptom of anorexia to misperceive your appearance despite hard evidence to the contrary, your size being that hard evidence), you REALLY NEED TREATMENT TO STAY ALIVE. And you are concerned with whether you are satisfying him sexually. THIS MAKES ABSOLUTELY NO SENSE!!! WAKE UP.

I also take it back regarding the possibility to move out and have sexual rendezvous if you enjoy them. Even if do enjoy them, to the extent to which his presence triggers you into non-eating, it should be treated as a life hazard and as such removed from your life ASAP, as you would remove toxic waste. In other words, your physical survival should be prioritized over the sexual pleasure you might receive from being with him.

All of it is serious. Non-eating is an emergency situation. It is not a minor problem, but a grave problem and an emergency matter that should be dealt with using the methods of disaster relief.