You might think I am a psychiatrist, or perhaps a guy Dear Abby, to write a book about what it's like to be single in your 50s. Nope. I was just single in my 50s. And I needed help. Over time and trial and error of many approaches to dating (and lots of therapy), I began to figure things out. Single-dom in middle-age should not be a death sentence to your sex life or happiness. Think Steve Carell's character from Crazy, Stupid Love--when...