General Romance Questions:
What is an open-door romance? A book that contains graphic/descriptive sex scenes as an enhancement to the story and romance arc.
Why is open-door romance sometimes called Mainstream romance? Mainstream romance books reflect prevailing and accepted values toward sex and love. The intimate scenes in a open-door (Mainstream) romance are compatible to what you'd see on streaming/cable shows.
Is erotic romance the same as open-door (Mainstream) romance? No. In erotic romance, the intimate scenes are necessary for the story and romance arc. In open-door (Mainstream), love scenes are considered icing on the cake - good to have but not necessary.
What is a closed-door romance? A story without graphic imtimate scenes. Any intimacy either happens off-page or is described through non-graphic (hugging, kissing, etc.) and emotional descriptions.