Many of my romance books have clinch covers--known for showing luscious bare-chested heroes and beautiful heroines locked in a passionate and suggestive embrace.
The clinch became the standard romance cover in the late 1970’s. And, by the late 1980s, every cover of Romantic Times Magazine was cinch cover art for an upcoming romance novel.
In the 1990s the cover art softened with more pastel hues and the cover model poses alluded swooning more than ecstasy.
Also, in the late 1980s and early 1990s many book covers for historical and small-town contemporary romances featured objects and landscapes prominent to the storyline. They clued the reader to the time and place of the novels.
Another type of romance cover is the cartoon cover as shown with this example of the cover art of Back To the One I Love.
Research has shown that readers who buy erotic romance ebooks usually favor cinch covers. Here is a cinch cover from my soon to be released novel, The Lynx and the Druidess, the final book in my Druidry and the Beast series.