As a reproductive endocrinologist, I often see subfertility affecting men too. It’s often in ways that they may not be able to voice to anyone, even their partners. Perhaps even to themselves.
In the context of fertility, erectile concerns can often be interpreted as ambivalence about having children. Some men may refuse to have intercourse, or otherwise turn away. They may claim that they no longer want to have children, when really what they are saying is that the situation has created a deep sadness in them.
If your partner might be experiencing male subfertility, talk to him. Validate and listen to your partner’s feelings within the relationship and in the bedroom. I strongly recommend counseling to assist both of you in maintaining healthy communication and a supportive partnership.