Here's a novel idea! Try focusing on romance with your wife, instead of sex. You will discover a side of her you never knew existed. Bring her flowers for no reason, but don't expect sex in return. Resist any urge to make a move on her if she shows appreciation for all the thoughtful, romantic things you are beginning to do. For example, at night, just cuddle her close, slowly kiss the back of her neck, tell her you love the scent of her and then fall asleep with her in your arms. She will be surprised at first, especially if this isn't your usual nightly rountine. But very pleasantly surprised!
Buy a book of romantic poems and read a few to her before you go to sleep each night. Kiss her fingertips gently and the palm of her hand more fervently - but don't go any farther than similar platonic expressions of love for a few days. Tell her she's beautiful, tell her all she means to you and why she does.
Be romantic, but hold off on the passion for a while. Before you know it, she will be feeling some serious pangs of loving desire for you and will want to express them. That's the time to start out slow an soft - until you both can't stand it any longer!
Put a couple of candles in the bedroom, but don't light them just because you want "sex." Light them any or every night because you love her. Don't be shy about whispering in her ear all those soft romantic things women long to hear. Let her know how precious she is to you. She will know if you are sincere, and she WILL respond! Once you get the hang of being romantic, you'll find it is an art - and the more you practice it, the more exciting your mutual passion will become. After all, for a woman, sexual desire is comingled with love. She needs to feel special to - and appreciated by - her man. She wants to feel tenderly loved. That's what arouses her... and with time, she will become more creative in wanting to please you. There is an old saying, "There are no frigid women, only inept men." But, of course, the fact that you cared enough to ask the question proves that you are far from inept. Your wife is one lucky lady! 