My wife has a not very repressed naughty side and I was the guy she met at a club after her prior break-up that pinned her down and fucked her. I later took her ass, stretched her pussy until I could fist her, which drove her wild, etc. We had some wild times but then marriage, kids, years of familiarity... I think it is impossible to maintain the same excitement. We sill occasionally have great sex, typically after going out drinking somewhere but other times it feels more routine. Extra difficulty with remote work, where you're both at home, seeing one another all day. Not much mystery. I think especially for the woman, part of that thrill of being taken control of and fucked hard loses some its excitement once the partner becomes too familiar and safe.
She doesn't think she needs anything more but I can tell, we both do and recent discussions / follow up sex suggest I'm right. For me, I'm not really a submissive type, so I think I am excited by the competition of it, knowing other men want her (potentially some day "have had her") makes me want to possess her and fuck her harder.