I had one that fucked with me for a little bit until I got my head around it. I was really turned on by cumming on a sleeping womans face. Obviously it was agreed on beforehand that that was ok, consent is king after all.
I couldn't figure out why I liked it so much though, its such a predatory and creepy thing! But then I realised it wasn't the sneaking up to avoid waking them or the cumming on their face while they were asleep that got me off, as much as it was their enthusiastic and genuine reaction when woken up by it!
That surprise awakening, still half asleep and realising whats happening and the happy smile that comes with understanding its all for them, and then love for cock taking over and and enjoying whats happening etc. Its that instinctual love for cum and cock that gets me off because its hard to teach and its a pretty genuine reaction from dead sleep too!
My other thing is variety. I find I appreciate what I already have more when I can try the grass on the other side if that makes sense? Like as much as you love some one, they cant change the colour of their skin/ethnicity, or their height, their sense of humour, their interests and hobbies etc. Hell, some stuff you can change like a profession or hair colour, etc, but for curiosity and satisfaction sake, its not worth it. And it doesn't mean I dont love that person, or love them any less either. Some stuff you shouldn't change too, like being pregnant just for a kink, particularly if you dont want kids!
As I like to put it, you could have the absolute best steak in the world every time you got hungry. Undeniably, you're eating the best steak in the world, and you love it, every other steak pales in comparison. But after a while, you lose that appreciation for just how good it is, its normal steak to you now. You still love steak, don't want to not have steak on the menu, but you start wanting to try something different to break that up and make you appreciate the steak for all that it is again! Something terrible will really make you appreciate the steak wont it? That's kind of how I feel in a relationship. Monogamous, but with wiggle room for both of us.
I also made a list of sexual things I wanted to do before I died. Like a bucket list. So I called it my FuckIt list. It got so extensive that I had to break it down into a spreadsheet with multiple sections on it, just to keep track of everything!