Baggy, ok I'll try to explain it...I think I already said something similar to this recently on someone's thread but anyway I'll try again....
When a man is coming at you with the intent of taking you, your body almost involuntarily gets aroused. My theory is that because in nature, in some species, a male can and does overtake a female sometimes, and although she may in her way "consent" to it, so may also not really have much warning or willingness. So nature has set it up so that her body will get aroused, knowing by hormones and pheromones floating around, that she is about to get taken. Nature is kind to her in the sense that, it will allow her to automatically get aroused so that she doesn't get injured in the process of him taking her. (IE: if she isn't wet and swollen, it is going to hurt when he penetrates her).
So now lets go back to humans, and a woman knows a man is about to take her. The same process begins. Her body begins to get aroused on very short notice, essentially the same moment her BODY realizes it is going to get taken (which can happen before the mind realizes it, because of the pheromones, etc). Now her mind has to get on board too, so in comes to play the stuff you wrote about how your wife feels safe and secure, etc. If she didn't, she'd bat your ears and tell you no, whether aroused or not. But because her mind gets on board due to the foundation you have laid, she allows her body to "go with" the arousal...
So this particular type of arousal, the type that happens automatically in the body in response to a male about to take you, is VERY VERY yummy feeling arousal. It is very instinctual and natural. It definitely makes you feel like a woman. Most women can begin this arousal process by simply *imagining* a man taking her or attempting to take her.
This arousal is different than the kind that builds up and happens slowly in response to *sexiness*. Arousal in response to sexy and stimulation has its own pleasure and wonderfulness, but it is a *process* and it requies much more mental participation than the arousal that occurs without your mental participation necessary, as when you are about to be taken. Something about the suddenness and the involuntary aspects of the primal arousal that happens when you are about to be taken make it very VERY yummy and HOT.
The other type is yummy and hot too, but it like the "oven" John Gray describes in women's arousal cycle. By the time you are baking the goodies, its awesome! But this other type of arousal is like a microwave and goes from zero to 60 in just a moment of time...and that moment is the moment your body realizes your man is about to mount you!
When a woman doesn't have to think about getting aroused and instead it just happens naturally as in the case of getting taken, it is just plain more PRIMAL and SEXUAL than the other way of arousal....