My god, this is hard to answer, yet I feel compelled.
Been writing smut 14ish years. For the first four I didn't even know I could get turned on, to be perfectly honest. I wrote out of morbid curiosity. Then I was writing m/m specifically because it was so far removed from my own sexuality that it was non threatening. It was about abandoning the expectations of gender roles to me, so the sex I was writing had meaning, but by no means did it get my engine revving.
It's just recently, within the last 2 years that I really began to get into the smut I was writing on that level. Maybe I evolved, maybe I devolved, but either way it definitely changed the way I write those scenes.