Frequency is the wrong primary variable, but it is also unavoidable. Couples fight about it, count it silently, lie about it on surveys, and use it as a proxy for the health of the bond — sometimes accurately, often catastrophically. The honest position is that frequency by itself measures almost nothing. Two couples having sex once a week can be in entirely different relationships: one is engaged, mutually aroused, looking forward to it; the other is performing a duty. Two couples having sex once every two months can likewise diverge: one is in genuine distress, the other is sailing through a temporary low season with full mutual trust. And yet frequency cannot be dismissed. Sustained mismatches between the rate one partner wants and the rate the other delivers are among the most reliable predictors of breakdown in long partnerships. Pretending the number doesn't matter is as foolish as pretending it's the only thing that does.
A Law 4 design approach refuses the binary. It treats frequency as one output of a system, not as a target to be hit. The inputs to that system include: physical health, sleep, stress load, hormonal life-stage, the quality of non-sexual connection, the architecture of the week, the presence or absence of small children, the unprocessed resentments stored in the body, the porn consumption of each partner, the medications either is on, and the question of whether the sex itself is actually any good. Move any of those upstream variables and frequency moves with them, often without anyone having to "try harder." Couples who skip the upstream work and attempt to legislate frequency directly almost always fail, because they are trying to engineer the smoke rather than the fire.
The deeper design question is not "how often" but "for whom, and to what end." A relationship designed for both partners has to acknowledge that desire is not symmetric, that arousal patterns differ, that the partner with lower spontaneous desire is not broken, and that the partner with higher desire is not predatory. Basson's responsive desire model has done more useful work here than perhaps any single piece of clinical research. The bulk of partnered desire — especially after the first eighteen months, especially for women, but not only — is responsive, not spontaneous. It arises in the context of physical and emotional closeness, not as a thunderclap. A couple designed only for the higher-desire partner's spontaneity will starve the responsive partner; a couple designed only for the lower-desire partner's pure willingness will starve the higher-desire partner. The design problem is real.
A workable design recognizes a few things at once. First, that there is almost always a higher-desire and a lower-desire partner, and that the role can shift over decades. Second, that the lower-desire partner usually has more control over whether sex happens than the higher-desire partner, which produces a quiet power imbalance neither one chose. Third, that turning sex into a contractual obligation destroys it, but allowing it to be purely opportunistic in a busy life means it will simply not occur. Fourth, that the goal isn't a number — it's a state in which both partners feel that their erotic life is something jointly tended, not something one is begging for and the other is reluctantly granting.
The practical move is to lift the conversation from frequency to conditions. What conditions make sex likely, pleasurable, and wanted by both? When do those conditions actually exist in your current week? If they exist rarely, the upstream variables need attention before any frequency target makes sense. If they exist often but the sex still isn't happening, you have a different problem — usually unspoken resentment, mismatched scripts about who initiates, or unaddressed dissatisfaction with the sex itself that one or both partners haven't found a way to name.
Designing for both partners is not splitting the difference. It's building a shared erotic life rich enough that each person, on most occasions, gets something real out of it. Sometimes that means the higher-desire partner accepting that the system will produce less sex than they'd choose unilaterally. Sometimes that means the lower-desire partner deliberately cultivating receptivity rather than waiting passively for desire to strike. Almost always it means both partners learning to talk about sex — what they want, what they don't, what's changed, what's stale — in a tone neither accusatory nor performative. The couples who get this right do not have a fixed frequency. They have a working system. The frequency is the byproduct.