We are told he has three kinds of sexual interaction with Alma:
vaginal sex
anal sex
rolling to the wall and falling asleep
He produces two children in short order then no more, yet he seems to have a dislike of using condoms ...
Ennis refused to wear a condom
only when Alma asked him to wear one in order to avoid a (dreaded) further pregnancy, and that doesn’t mean that he disliked them
per se.
When he refused he told her that “he would be happy to leave her alone if she didn’t want any more of his kids.”
My reading of this is not that he disliked condoms, but that he wanted to father more children (preferably one of which was a boy, as he mentions later to Jack), which rather undercuts the idea that he was “proving” that he was heterosexual—there was surely no need, after fathering two daughters, to provide any additional “proof.”
It also suggests, and is supported by Alma’s reference to “rubbers,” rather than “
a rubber,” that their heterosexual (non-anal) intercourse occurred frequently (perhaps not regularly, but often enough to warrant her choice of the plural noun) as well as that Ennis enjoyed what they did, (hetero-)sexually, together.
Ennis’s response, that he’d “leave her alone if she didn’t want his kids,” could also be said to indicate that at other times, in which he’d
not worn “rubbers,” he’d similarly wanted to father more children.
However, because of their financial situation (which Ennis did little to improve) and because her job as a grocery-store clerk (taken on to pay the bills) required her to be away from their apartment, she eventually decided that even two children were enough to feed and care for as she’d have liked; a third child would have worsened an already unsatisfactory situation.
In other words, while Ennis
was prepared to father another child, Alma
wasn’t prepared to conceive one.
As for his “propensity to roll to the wall and sleep as soon as he hit the bed,” that’s what a disgruntled and bitter wife
would say about a husband who was “disinclined to step out (
with her) and have any fun,” who did little to earn a better salary and who failed “to look for a
decent! permanent job,” while completely overlooking the fact that the jobs in which he
did work, and for “long hours,” were physically arduous. (As we’re told, he was “ brought up to hard work” when young.)
If Ennis also had to put up with Alma’s nagging “misery” voice whenever he got home I’m unsurprised that he’d roll to the wall and sleep as soon as he hit the bed, and not only because he’d have to get up early for another long-houred day’s ranch work.