:d 1st I would like to say that is so honorable your thinking about your wife to where you would ask for help. Have you tried any sex toys or having sex less often. Me and my fiance went through that 2 yrs ago we were have sex everyday and it got played out so its 1 1/2 yrs later we do it less often. Sometimes once a week or when we are stressed out. Women we are satisfied by just knowing you love us enough to do what you are doing now seeking help to fix this. So try to give oil messages and role play. Vibrator on the clitoris while your on top my fiance said. Sucking her toes more stimulation like sucking her breast and caressing her clit while your on top. We like it kinki and rough sometimes like when I get off work he messages my feet. Orgasms come in many ways I not always wit cum coming out. They come small too like mentally those are my favorite anyway like when he cuddles me at night after a big fight and say im sorry sexy I love you even though your mad at me and I get tingly thats one. Exercising helps her libido get higher and anal is iight I guess but if your desperate shoot. I like it kinki so I don't know ask her what feels good or you can always tell her to touch you how she wants to be touched. Only she knows what pleases her and ask her for directions to the treasure on her map. Try g-spot too its 12'o clock on the front(top) wall of the vagina.It feels like a dime shape but when she is horny is a quarter. Hope I helped a little and good luck to u two.

a full proof method we have found that works, is hubby sucks nipples and plays with clitoris, for around 10 to 12 mins in our case, and I am guaranteed an orgasm everytime. Their is a stong nerve link between nipples and clitoris, and after about 5 mins of sucking firmly ,and stimulating clitoris, my clitoris starts to dip, and " search" for some touch, after another 5 mins usually, i reach my climax and have the involuntary vagina clenching 5 or 6 times as I reach my orgasm.
It may not work for all women, or you may need up to 20 mins or longer.