From my experience sex gets better with the same woman over time as you get to know her and she learns you.
Sadly too many women are horrible with making relationship decisions and make horrible choices on who to be with, leading to a society of people who really don't belong with each other, but they stay together because it's familiar, a good look on social media, or financial reasons.
These are the relationships that lead to dry sex.
These dry sex relationships lead to 20+ yr old me

being thrown some fire p*ssy cause the husband wants something different and the wife wants hot sex.
One of the greatest lies women tell themselves, sex isn't everything in a relationship. It's not everything by definition, but if the sex game ain't right and it goes stale you might as well toss it in the bushes because that need will be rectified. So sex needs to be at the top of the list
And how many married men out there actually check up on their wives, like telling her u going out of town on a business trip to a convention on the west coast, but Friday/saturday evening 3am u walking through the door? Trust me, kids know how to keep a secret, just buy them the video game they wanted and now you the greatest.
All that constructive talk sounds good but I've seen the tears from a grown man's face when reality hits, that's your wife legally but she's this guy side piece. U just a paycheck/daddy to the kids, may not even be your kids u need a paternity test and u scared to get one cause of what the results may be.
A lot of marriages need to be called out for what they are, rentals like blockbuster video. Remember how they had daily, weekly and monthly rentals? Same thing with one night stands, relationships and a lot of marriages.
At the end of the day she going back to the store.