I think there's another theory, far less complex, that would explain her behavior:
She loves me, loves being married and loves our family, knows sex is very important to me (primary LL), but just isn't attracted to me.
In fact, by her silence to me asking her that last year, she more or less admitted that.
Attraction and feeling "in love/lust" come and go, and silences could mean pretty much anything. Even if we assume for the sake of argument (and there's already been a few on this thread :D) that's what her silence meant, not feeling attracted to you at a particular moment in time doesn't really mean much to your relationship as a whole.
It is in the shelter of each other that people live.--Irish proverb
