First, here's the original Reddit post.
tl;dr This dude uses a self-curated playlist to keep him on rhythm during sex. His girlfriend of 2 years just now told him that his favorite song on said playlist turns her off "in a major way."
Now... the song.
How that dude found that song sexy in the first place, we'll never know. But also... THAT is keeping him on rhythm?? Which rhythm?? Please, dear lord dear god, ANSWER THE QUESTION OR ELSE WE WILL HAVE TO ASSUME IT'S THE MELODY and that really paints a picture.