MYRON by GOREVIDAL 244 pages. Random House. $6.95.
Fans of Myra Breckinridgethat beautiful, transsexual, all-American succubuswill recall that she was last seen in a hospital bed after having the silicon knocked out of her by a hit-and-run driver. To save her life, Dr. Mengers rebuilt and re-endowed her as Myron Breckinridge: the man, in fact, who Myra had originally been before a sex-change operation transformed him into a her. Though the doctor fashioned a generous "rehnquist" for the new Myron, he did not provide him with a set of "powells."
Renaming the nether parts...