The sad news is that it might get worse, not better with time. When I met my future wife we had sex about once a week. Even did some fun non-standard things. As the years went by this very gradually decreased, every other week, now once a month. The number of different things we did also decreased, now we are pretty much down to the same thing every time. (one by one she decided she didn't like, or found uncomfortable the others). Most recently she has lost interest in even seeing that I orgasm - says she is too tired "this time". (I always take care of her). But now, after being married 25 years it just isn't possible for me to leave.
I don't want anyone else to fall into this situation.
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