No one

My husband has been unknowingly addicted to porn since, we believe, he was a teenager. We met and issues arised around having sex. He was unable to keep an erection and ejaculation was impossible without porn. Unfortunately his issues are deep seated. Throughout our relationship he has managed to stay off the porn for periods of time in which the impotence became less of an issue but he has always gone back to porn, especially at stressful times. Since we married he has found staying off porn more difficult and as we want to try for children we are finding ourselves in a difficult situation. The stress of wanting to conceive and the issues around porn and the impotence that it causes is putting a huge toll on our relationship. We have searched for support but have not found any services which are appropriate for our situation. Any advice?