People change. Their preferences and desires change.
With that in mind, it is a good thing to hold onto who you think your spouse is rather loosely.
Practice asking questions and listening.
It will keep you aware of who your spouse/SO is on an ongoing basis.
This is true for both in and out of the bedroom.

A good marriage/relationship is one which allows for change and growth in the individuals and in the way they express their love. Pearl S. Buck

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