Is it just my observation, or does it happen in many long standing relationships/marriages where sex becomes a means of bartering. It seems to become a device or means of getting something someone in the relatiosnship wants.

I often wonder if it actually works. Or when that happens does it change the nature of sex. Does sex just become another household chore, or a means of payment or payoff? A reward?

Are there real benefits I'm missing in my observation, and does everyone always keep their end of the bargain?

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