I have been off and on a bio of Highsmith: Beautiful Shadow – A Life Of Patricia Highsmith, by Andrew Wilson, in which there is an anecdote of Highsmith that I could not get over it:
During her late 20s, Highsmith was troubled by her sexuality and she sincerely wanted to fix it, because she wanted to marry a man who deeply loved her. So she underwent a therapy, believed it would eventually convert her to heterosexual. Since the therapy was extremely expensive, she had to take another job in a toy store to catch up with bills. It was in that store she met a female customer, who inspired her to write her second novel Price Of Salt (also published as Carol in later editions) – one of (or the only one) greatest romance books about lesbians relationship, or any love relationship!