The'clean' part of the title is a welcome thing for many readers who do not see why every book must be an erotic novel. For myself, reading with graphic sexual content seems a bit immature, something adolescents who are eager to grow up and experience the real thing sneak around with to avoid their parents catching them. But of course, the world has unfortunately 'over-matured' and many adolescents in our current era no longer have the problem of waiting for experience. They just have the problem of caring for their children or contemplating such things as abortion and birth control long before such awesomely serious decisions and childcare duties should challenge them.
In my writing, I find that a good, realistic, dramatic portrayal of life can be displayed and revealed without delving into the very private moments of my characters. I have written stories now that have engaged readers who then reported back as to how personally involved they became in the lives of the protagonists, and not once has anyone complained that they did not get to vicariously enjoy the honeymoon night of any of the wedding couples. Many of my stories have put my female characters at high risk of sexual abuse. The tension of the coercive threat has been relatively easy to get across without too much graphic detail. The actual assault of a woman becomes more delicately challenging in a book that attempts to avoid too much such description. And there are times where such a crime may be necessary to describe to some point, due to the need to show the effect on the surviving victim. Again, the worst of details are not necessary. Mature readers should not need to be titillated. Immature readers should not read thoughtful books without guidance.
For the question of 'good sex' of the kind between spouses, and perhaps in fiction those hopefully to be spouses: my protagonists are quality people, and though not flawless they are generally moral. I respect these characters as if they are friends and I do not need to look into their bedrooms. I know what happens there, and the reader should to. If something were pertinent to the story, it would be covered; but, since my topics are not sexual relations, my stories are not likely to ever go in that direction.
This writing scenario serves me well as I tell about generally ordinary people and their problems in daily life. These people are moral, generally Christian, and of enough quality of character that moral indiscretions are unlikely to need to be described. the normal, moral stuff can be imagined by the reader. In this way, though marketing was not the primary reason for writing 'clean' literature, there will be a wider reading audience. I hope these books will be discovered by high school teachers because there are some good themes in them for that age group. Many old classic works of literature that involved some of the great romances in fiction were not erotic. I would rather be in that company than commercially successful and in the erotic literary camp.