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.
Another reason could be that they have heard such stories from other sources and are simply repeating them. They may not fully understand the implications or sensitivities around same - sex erotica but do it anyway because they find the story interesting or funny in some way.
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.
Yes, it might be related to their sense of masculinity. By telling these stories, they could be testing the boundaries of what is considered masculine. In some cultures, there is a strict definition of masculinity that doesn't include any form of same - sex interest. But by telling these stories, they are showing that they can be open to different ideas without threatening their own sexual identity.
I'm not sure there are specifically defined 'erotic stories' in a mainstream sense for 'Mad Men'. The show mainly focused on the advertising world in the 1960s. It did have storylines about relationships and affairs, but not in a purely 'erotic story' way. It was more about the complex relationships between the characters, like Don Draper's many affairs which were more about his character's flaws and the social context of the time.