Let my try some words... well, I dont think that all men "only like the loser" - to say it in simple words. But, maybe we can have a poll to check who likes losers and who likes winners?!
Me, I like both. A triumphant winner is something great. It's nice to see her dominate, to see her grin at the loser, to see her mock the loser.
But, I also love losers. I love to see them exhausted, to see them disappointed, and out of power. My theorie (for me) is, that it is about the exhaustion.
My theory is that it's about exhaustion after the fight. The moment after a submission or heavy defeat is similar to the moment after an orgasm. The person is lying on the floor, breathing heavily, completely exhausted. So my theory (for me) is that it is this feeling after sex that is so emotionalising for us with losers.