Author's words in Proverbs 5:20 compared to his way of living?

>And why wilt thou, my son, be ravished with a strange woman, and embrace the bosom of a stranger? (Proverbs 5:20, KJV) It is well-known that Solomon had many wives and concubines. It seems that the advice he is giving here contradicts to his own way of living. How is this seeming contradiction usually explained in Catholicism, Orthodoxy and main-stream Protestantism?