I found this thread only today, interesting discussions indeed. There is something however that wasn't discussed, the fatherly kisses of Ennis. We all aggree he looks sincere and passionate only when he kisses Jack. What about his daughters? He is as sincere here as a father loving his daughters.
1st example when he holds and kisses a crying baby Jenny.
2nd example, the last scene at the trailer when Junior steps out the car and she gets a warm welcoming kiss from her dad.
And thare are sad kisses like, when Ennis is about to leave for his first ''fishing trip'', he kisses both Junior and Alma on the cheek (''see you Sunday Ladies'') and he looks so guilty.

Alma's world collapsed because she witnessed her husband kissing another man like she was never kissed before, this is one sad scene when she is left alone holding Junior. :\'(