No. Writing and promoting erotic content, regardless of the gender combination, is not ethical. It goes against moral and social norms that promote healthy and respectful relationships.
To write men's erotic stories, men should be true to their own experiences if they are using them as a basis. But also, they need to be creative. They can take inspiration from art, music, or even nature. It's important to create a connection between the reader and the characters. The descriptions of the characters' feelings and actions should be detailed and nuanced. For instance, when describing a moment of attraction, don't just say 'he was attracted' but rather describe how his heart raced, his palms sweated, and his eyes were fixed on the other person. Also, they should consider the pacing of the story. A slow - building story can often be more alluring than a rushed one.