Women likes tons of sexual fucked up shit they separate as romance and it makes me escape from Earth lolol.
If you have an interesting story or a parody sense of humour ideas even I would write a dark romance novel but who and why anyone would read it other than something interesting and parody is the actual question.
Those who are interested in this BS loves to gain POV from another women so they can adjust their life, just day dream as the main woman character for "fun", but if the novel written by a man they can still be curious about "how fucked up men's mind can be" but they can be cringed for how a man trying to emulate how a woman is which is fundamental problem for writers. Not many writers can write realistic opposite sex characters which is one of the reason why, for example, Harry Potter books are cringy. The woman writer could never write realistic male characters. So your challenge is not being able to write a decent "dark romance novel", it is being able to write realistic woman character that won't make the reader stop reading even cursing at your aunt, you managing to write this woman character in the realistic woman POV to tell the story. If you cannot do that whole point of dark romance gets pointless.
There is also the indication of this: Any fiction targets women actually rather intentionally or not have unrealistic male characters. Again Harry Potter is an example. Instead of how men actually are these are fictional male sex that can only exist in a woman's fiction because it's how they believe men are and how they want men to be. This indicates your 2nd challenge is being able to write unrealistic male characters in the way women believe this is how men are and the men types they want. Unless you studied psychology by diving deep into neurology, biology and genetics it is really hard for you to write a women's fiction without being a woman but good luck on being able to come up with characters and situations a woman would wanna experience in the safety of a fiction lol. But I have one tip: The only thing in the novel has to be realistic is the women characters but they cannot be realistic if you follow stereotypes. You may follow MBTI for "safe bet" as tons of writers does to make characters seem realistic and to avoid stupid social stereotypes. Oh and another tip: Women likes to see personality types in fiction that is based on real-life personality types from Big 5, zodiac types, MBTI and even blood types because they tend to study such stuff. And then last thing about it is the "cringe" part. What women likes may be cringe for a man but without this cringe it cannot be "dark fantasy novel".
