Hello, welcome to health care magic. I am Dr Alok Sinha, MD Psychiatry from India. I will try my best to answer your query. I have carefully read your question and I understand your concern. It appears that he is going through a depressive episode. Apparently this depressive episode has set in because of inability to impregnate you. As you told, you both are trying for another child but still could not get success, and you got clean chit for any female factor of infertility by getting checked many times. Due to all this it is quite obvious that he has developed a sense of low self esteem, poor confidence and may be worthlessness due to perceived guilt of inability to impregnate you. He knows that he is the cause of it and also developed a thinking that nothing is going to be right in future. That is why he perceives sexual activity useless. As you both are trying for second child since last two years and his depressive symptoms appear later during last one year, it is quite obvious that his perceived disability has come first and it is the main cause of depression. I have seen that even an old fashion man visits many quacks and doctors when comes to his sexual dysfunction. If a person is not ready to visit a doctor even after a significant sexual dysfunction then it further points towards depression. Presently he requires psychotherapy and some good antidepressant medication along with your support and care. I suggest you to make him visit a psychiatrist at any cost, as the treatment is already delayed and you both have suffered enough. Therapy may bring happy change in your married life.