The referendum read
The friction often arrives when a partner reads the wanting-for-edge as a referendum on the relationship. Why isn't what we have enough? It usually isn't a comparison; it's a body that needs a different kind of stimulus to register fully aroused. But that distinction is hard to communicate without sounding dismissive of regular intimacy, which this reach genuinely values.
What helps
"Tell me what would actually do it for you." "I want to know the version of you that doesn't get to come out very often." What helps: a partner who can hold the conversation, and the experimentation, without making it a verdict on either of them. Naming the distinction plainly takes the referendum off the table: "This isn't about you not being enough. It's about a specific kind of switch in my body that only flips one way." Once that's said once, in a calm moment, it can stop being said over and over in the heated ones.