W.B. Yeats underwent the Steinach operation in 1934, which transplanted monkey glands into his own reproductive organs to give him what he felt were rejuvenatory powers of a “second puberty.”  That absurdity aside, I can’t stand his poetry for some reason as it seems overly egotistical, maudlin, and theatrical (for me, he is one finger of Shelley scotch and four of water), though I fully support anyone who enjoys it and finds real merit to it.  To each his or her own.