The quiet counting
The friction often arrives in long relationships, where mismatched desire is the norm and someone is almost always doing more of the reaching on any given night. In exchanging, years can pass quietly counting, even when you swore you wouldn't, and the counting starts to do damage to the very mutuality the reach is for.
What helps
"I'm here. I want this too. Let me show you." "I see you doing the reaching tonight, and tomorrow I'll do it." What helps: a partner who can articulate their own wanting clearly enough that you can stop wondering whether tonight is one-sided. The counting quiets not when the ledger evens out, but when the wanting becomes audible: when you can hear, in the partner's words and body, that this is mutual even in moments when the act itself is asymmetric.
There's a quieter cost worth naming. When the partner senses the counting, even without it being said, they sometimes start performing matching reach. They voice wanting they don't quite feel, initiate when they're not quite there, give what looks like equal reach but isn't grounded in equal wanting. You can usually feel the difference, and now you're worse off than before: you got the matching gesture but not the matching wanting, and the loneliness deepens. The fix is to ask not for more reach but for real wanting, named honestly, even when that honest naming is I'm not there tonight. A true no spoken with care meets this reach more than a performed yes.