Edward Albee's The goat, or, Who is Sylvia?
"In the play, Martin - a hugely successful architect who has just turned fifty - leads an ostensibly ideal life with his loving wife and gay teenage son. But when he confides to his best friend that he is also in love with a goat (named Sylvia), he sets in motion events that will destroy his family and leave his life in tatters."--BOOK JACKET.