In the stories, Dr. Watson is pretty much of a ladies man. He also gets married. Sherlock is mostly non romantic except for “the woman” Irene Adler. Even with her it is mostly admiration rather than love.
“A Scandal in Bohemia”... was the title of the story with Irene Adler. Or, “the woman”. (I had to look it up or it would have driven me crazy all night!)