("Epe" posting again, here)
My husband sounds VERY similar to you - if you hadn't confessed your age in an earlier post, I might suspect he was writing your posts. ;)
We got very honest with each other very early on cuz both of us were older, and my husband had been burned in many previous relationships - if not by the relationship itself, then by the fact he wasn't his "true" self with the girl and HE was always in conflict and then self-sabotaged. So HE knew, going in with me, that he had to be "all or nothing" .. in fact, he was convinced once I knew how he was "inside" (including the "darker" parts of himself), that I wouldn't want him anymore. And because I was basically a real-life-40-year-old-virgin, he was terrified he'd "warp" me.
Turns out I bend, but I don't break. ;) And if I'm "warped" it's only insofar as I'm better FIT to him than before. But better fit to MYSELF, too.
And again thank God (!) I knew enough to NOT say yes to marrying him until we were both sure that "all of him" internally wanted to get married. I didn't have to feel "loved" by every part, but every part needed to be "in agreement" or I knew HE'D never be at peace with us. So our "romance" didn't have any of the traditional frills or thrills of New Love. Ours was a romance of a LOT of intense, hard, psychological and spiritual labor, a lot of hashing out what's ok, what's not ok, what's "unconditional love" LOOK like for us, etc.
And we have incorporated plenty of "kinky" into our love life as a result, too. ;) We have a "rule" that anything is fair game as long as we're in agreement to try it, and this is subservient to our FIRST rule, which is "do no harm" - that "harm" might mean, all of him is in agreement except one part? Then we don't do it. Or all of him might want to try something, but I'm uneasy? Then we don't do it. At least until one or part of us is "at peace with" the trying. Our aim is to be, as Adam and Eve were in the Garden, "Naked and UNASHAMED." This also means FREE .. "no mistakes" inside our oneness....
My husband's internal, um, "caveman" as you put it ;) is very similar to what you've just said - certain things have to line up a certain way. But that's really true of ANY of his parts. Even his more "feminine" submissive side meets up with my own inner .. um .. caveman. In some ways - probably more because I'm very empathic - I have "parts" too .. just not as individuals inside. So I move more fluidly inside my "moods" or attractions/interests/imaginations .. That means when he "switches" .. I follow suit. (LOL) .. It ALSO means I need to learn to "draw out" certain aspects of my husband. He's very not traditional alpha male in most respects, either. And while he as a whole is highly sexual, he is more "submissive" and so not as apt to initiate. That presents a TRICK for THIS girl who spent more of her life on sexual "shut down"! So I'm really studying up on the art of seduction! (LOL) .. I ain't good at it .. My husband has been my ONLY "lover" .. but he can get turned on by my clumsy efforts, and I know he loves me no matter what (no mistakes!), so that boosts MY confidence, which he desperately needs me to have if I'm going to be the more initiating. I don't have the luxury of being the "traditional" girl, either ..
So the whole "girly" longing to be wooed first, or romanced and seduced? Meh. Overrated. ;) I love HIM (ALL of him!). I want HIM (ALL of him!). So the "how" is completely flexible and an area in which we BOTH can study and grow and study EACH OTHER and adapt, etc. Sex isn't the BASIS for our love, it's just perhaps the most intimate and comprehensive physical EXPRESSION of it. We don't BUILD on sex; sex is the "flower on the table" (NOT one of the "table legs" of the relationship - the LEGS are intimacy of the 1) Mind/Intellect, the 2) Heart/Emotion, the 3) Soul/Spirit, and 4) Strength/Physical attraction and "fitness" to one another)....In fact, the degree to which people try to make sex a "table leg" is, we are convinced, the main reason so very many relationships fail.
We are free to "fail" and get back up and try again. We WORK HARD at the things that matter, and we always strive to take good care of one another .. so sexuality - despite the fact we are the MOST unlikely pair in this area! - becomes something BEAUTIFUL and not a stumbling block between us .... And we pray a LOT. (LOL!)