I do all the initiating. Well, 99%. Not my preference but that's how it is and has been in twenty five years of marriage. My wife might initiate once every two or three years (no exaggeration).
But we've got a rock solid marriage, love each other to bits and have good, mutually enjoyable sex at least twice a week which is probably the most satisfying we've ever had. There's plenty of non-sexual bedtime cuddling as well which is great with no expectation of anything else necessarily.
But when it comes to sex it's always me who initiates, which I accept now, although for a lot of years it was really tough-going pretending not to mind when I longed for her to initiate sometimes and she never did, and feeling like a sex pest when I suggested sex and she said no, etc. It was a desperately lonely, empty feeling.
I'm way out of the other side of that now. I accept and love her for who she is (and vice versa), understanding a lot more now of what makes her tick as a person, mentally, emotionally and physically.
But - to answer the question - on the rare occasions she does initiate: WOW! She goes straight for it. She doesn't ask permission or anything like that. It's like an overwhelming tidal wave of feminine desire. And do I mind? Absolutely, totally not. It's fantastic. Maybe that's because it happens so rarely. Although I don't think I would honestly ever mind if she did this every single day. But maybe that's just me, as I've always been a randy beggar really. Or maybe it's because we've been married a long time, really do love each other and assume that consent is a given unless one of us makes clear otherwise.
For my part, when I initiate, I can honestly say I've always put the ball in her court as far as whether we have sex or not. I ask and am clear about what I'd like us to do and would she like to do that as well, or maybe something else? "Yes" or "No" is up to her. Often it's "Yes" , which is great.
Apart from the ethical (not to say legal) rightness of that, sex can never be the amazing, mutually enjoyable lovemaking experience it can be if both parties are not 100% up for it.