Shallow people creates shallow sex, and most people fail to understand that novelty is nice for a one-time thing, but real intimacy and crazy requires the ability to do a lot of random sexual acts over a period of time.
One doesn't dwell and live in a world and realm where it is one size fits all.
Desire a threesome? Going the traditional FFM? Well guess what MMF is also needed.
Anal sex goes both ways, edging, vanilla sex.
So do each once great ... the allure is gone?
Well, intermix them and use them like tools in a toolbox and enjoy. Sex shouldn't be a bucket list, but one where it embodies a chapter in the story of a couples intimacy life.
At least that is how I see it ...