One on one Kratos would probably win, he's just ridiculously powerful (both in combat and bed apparently). He's killed countless foes, is essentially a god, killed craploads of people and gods, as well as the odd titan or two. Unless the emperor had significant tech on him at the time, he may very well die. Doubtlessly the Emperor would put out a significant fight, it'd be a titanic battle between two forces of nature, kratos probably would be mortally or at least gravely injured by the end and only narrowly win.
My advice to you is to get married, if you have a good wife you'll be happy; if you get a bad one you'll become a philosopher.
In the grim darkness of the future the economy has even hit daemons, The Changeling is working at White Castle and Skarbrand is giving head in the alley next to Fateweaver's.You ever receive fellatio from a rhyming demon? It's a bad scene man.
Sticking your junk into a fang-filled mouth that breathes fire doesn't strike me as particularly smart.
Which is why that option should be available to any willing to take it.
In fact, there should be fang-faced, firebreathing demons on every streetcorner offering to pay 100 dollars to give BJ's. The gene pool would be vastly better off without anyone incapable of thinking it through.