That's all true, Donnaread, and in my experience one can be intensely sexual with one person and far less so, if at all, with another. I think Jack was just the one for Ennis, not just physically but as a friend and someone with whom he didn't have to pretend, and more importantly with whom he could laugh and joke, something he didn't do with anyone else. Evenif passion fades, liking and understanding and friendship last; Ennis's for Jack might have done so, but I'm not so sure about Jack. I don't think he's a player, just someone who needs sex far more than Ennis does, and who in every way, not just sexual, is unwilling to be stoical, so he's not stoical about Ennis's absence but tries to fill it, even when he knows this won't give him what he wants. Jack is much more egotistical than Ennis, and much more prone to think he's entitled to whatever - makes him much more "modern" in my eyes.