wife promises a lot but doesnt deliver

hi there everyone, this is my first time on here, my wife and I have been married for 20 years and have had a great sex life in the past, for the past year we have sex about twice a month, but half that time it feels like she does it out of duty rather than enjoying it, we have both had medicals from our docs and we are both in good condition, I have always been the good husband and bought her flowers and doing romantic stuff, I also do more than my fair share round the house, I have talked to my wife about the lack of sex and she doesn't see it as an issue, it bugs me even more as she will make sexual innuendoes in front of friends but none of them ever come true, she will text me to say am I up for it tonight and then nothing will happen! I am at the stage now that I don't want sex with her as the frustration of not getting it is doing my head in, fed up and pi**ed off.

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