Goodreads
Goodreads asked Lex Lander:

Who is your favorite fictional couple, and why?

Lex Lander Spenser, (his first name is never revealed) the private eye from Robert B Parker's crime stories, and his muse Susan Silverman, in the long-running series that came to an end with Parker's death in 2010.
Why? Because of their mutual wisecracking and sexual innuendos. Their sexual relationship too was subtly expressed yet in some mysterious way came across as explicit.

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