My problem with your position is when you cross into that "one flesh" territory, that's too far IMO. Isn't that tantamount to concluding that it's impossible to rape one's spouse?
I think you're reading too much into the "one flesh" concept. Here's a simple way to consider my view on sexual touch inside, versus outside, the marriage covenant.
Married: "Consider it go unless I say 'no'."
Strangers/Acquaintances: "Consider it no unless I say 'go'."
By way of example, I had established a sort of "signal" with my wife after years of marriage.
If she was in the kitchen working at the sink or the counter or the stove and I came up behind her, gently fondled her breasts, kissed her neck and said something like, "You're beautiful," or "I love you," she understood that that meant, "John wants to have sex at some point today."
Now, did that mean I was always getting sex. FUCK NO!!! haha
She might end up saying, "I'm on my period." Or "I'm too tired." Or simply, "I'm just not in the mood." Sometimes it was even the ultra-lame, "We'll see."
Now, at that point, had I forced myself on my wife in the belief that I somehow "owned" her, that would have been rape.
But, on the other hand, you can't just go up to your attractive office co-worker, casually fondle her breasts, kiss her neck and say, "You're beautiful," without expecting to be charged with sexual assault.