However, at the same time, be somewhat realistic. People are real and have flaws. Although you may want your story to have a certain aspect of perfection, having a person who has flaws and vices makes it more exciting. Too much perfection will make your story boring.

Use Proper Wording

In the narration, try to keep some elegance. Try to keep a balance between blunt and euphemistic. It's fine to use some off-color language in the dialogue, but the narration should not use language that is too graphic or unintelligent.

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Give Details

Sure, erotica is about two people having sex. That's a no-brainer. However, you need to add details in order to engage the reader. Any book can say "Then they had sex." How did they have sex? What were they doing? Where did they have sex?

What did the people look like? What were they wearing? What were they saying? These questions need to be addressed with as much detail as possible, or else readers won't be interested.