You know what? Jack is a slut...no two words 'bout it. That's one thing I didn't like 'bout the movie, the way Jack was portrayed as hunting down men just like how he hunted (seduced) Ennis...using that same charming approach. if you look at it on surface, Jack seduced every other man just like how he seduced Ennis...therefore, Ennis wasn't anything special, just another number-at-first. It just happened that in the event of his prowl, he fell in love with Ennis.