I always wonder each time I watch this scene...bearing in mind that they are fabulously talented actors and all.
As actors they were able to let go of their deepest inhibitions...and be Jack and Ennis...In those moments of letting go...they must have FELT something as human beings...not actors. Hence the beautiful realism...
I know in interviews Heath and Jake downplay the controversy and try their best not to focus on "the kissing" but I would bet good money that they were both like..."YUMMMMMMMMMMY" !!! They must have been turned on at some point...sexuality issues be damned...Am I the only one that has pondered this?
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You are certainly not the only one who has pondered this. Especially for men who have not yet been with another man (and same for women), the experience is so powerful and arousing. Even though they were "acting" and there were camera crews there...I don't know how it couldn't have affected them. I'm thinking, for instance, of the SNIT scene, the incredibly emotional tenderness, then Ennis/Heath lying down with Jack/Jake, and Jack/Jake lowering his body on top of Ennis's/Heath's, and the beautiful kissing -- how could Heath and Jake not have been aroused by that? Especially as they were trying to make it as authentic as they could. Same with the reunion embrace -- they were SO Ennis and Jack there, in the most essential of ways, down to their very cores, and I would think that that powerful strength of men loving each other would just have to affect them. The whole movie, their interactions of "acting" like men in love. They did it so beautifully, so they obviously put their whole selves into it.
Besides, not to be too crass or anything, but we do see several shots of them where they clearly are aroused, so excuse me

The male response (not that I can speak like an expert here; only second-hand) is so wonderful in its...what are the words...how relatively easy men get turned on...in its overtness and visibility, and no matter what they say, Heath and Jake shared something very strong on an emotional and a physical level. So that's my story and I'm sticking to it.
I do like to stress, though, that I'm not a Heath/Jake freak, but I am so an Ennis/Jack freak. So I don't mean to belabor this point...but I sure did, didn't I? I obviously have thought a lot about this.

kathy