When it comes to sex, Barbara Keesling knows what she&#39;s talking about. A noted sex therapist, sex surrogate and professor of sexuality, she was featured in <I>Playboy</I> magazine in a special photo layout.<P> In <I>Talk Sexy to the One You Love,</I> Keesling shows readers a new way to heat up their lovemaking without special toys, gadgets or superhuman agility. According to Keesling, the voice can be an incredibly potent erotic tool. The right words at the right time can start a fire burning inside that feels like it will never go out. To help readers hone their skills, she provides special exercises that allow them to vocalize sexual fantasies, have fun using enticing adjectives and read aloud sexy bedtime stories. Moving from tame icebreakers to bona fide ice melters, these safe yet stimulating lessons are just what the doctor ordered for a more electrifying love life.