IMO deathgrind/gore is the best music to have sex to. It guarantees that you'll have aggressive and passionate sex. That's the best kind right. It'll wake up your kinky animalistic instincts and you might end up doing wonderful things you've never tried before. Then, you don't have to worry about cheesy lyrics ruining the atmosphere cause you won't be able to understand anything.
I didn't imply you liked cheesy power metal. All kinds of metal have cheesy lyrics, and deathgrind/gore even more than other kinds, but the difference with other metal is that you can't understand what's being said.