Lateralus, I must disagree

There are several Heinlein novels in which he touches on the subject of intergenerational relationships:

"Time Enough for Love"- the protagonist all but says that he wants to screw his twin pre-teen daughters. Incest is a recurrent theme in this book, especially since he goes back in time and seduces his mother.

"The Door into Summer"- the protagonist falls for a pre-teen and later marries her.

"Variable Star"- this time the pre-teen girl falls for the protagonist, and keeps the relationship alive until she can marry him.
In both of the last two novels mentioned here, he throws a bone to the Establishment by having the girls grow up first, but the relationships began when they were 7-9 years of age.

Access the post above called "ping Seamus" by Dissident, and then click on the link to an article by a man who berates Heinlein for his writings on sex.

This quote from the article might interest you:

"His final series of books goes far beyond that, dealing extensively with incest and child sex.
In real terms a significant element is about child abuse, justified moreover in terms that any paedophile would recognise.
The most explicit example of what I would call a fixation on young girls..." etc.
It continues on in this vein for a while, citing example after example.

From the spellings I would say that the author of this diatribe is British, and by his referring to child sex as "child abuse" he makes his position immediately clear.

Had you read his works, especially the above-mentioned books, your opinion would likely be different. Reading the article that Dissident provided should give you a better insight into his feelings on the subject.

At NO time did he ever portray child-adult sex as undesirable, and I have read all of his books.