The goal is this: tossing out preconceptions of 'love' which are modeled on irrational and undersubstantiated grounds of reference. If 'love' is a commodity (buy-able, saleable, and fully transferrable) whose efficient distribution is forecast by neo-liberal logic, then the invocation of any tariffs/regulations/protectionist measures/or other barriers to trade will result in inefficiency and net economic loss. Remember: make the pie grow and everyone can have a larger piece. The problem is that some people can't stop at one slice.
So the doling out of love in return for payments (be they kinetic, spatio-temporal, or merely fiscal) will ideally be judged on rational grounds that accord a dependent variable with appropriately chosen independent variables. If our dependent variable, L, at time t is a function of log($) at time t [implicit assumption of non-linear bling-bling effect] and I (intelligence), A (aesthetic merit), S (socialization acumen), T (tennis prowess), and MMS (muffin-making skills) if and only if (IFF) all variables are t-tested as significant at the 1% level. We have attempted more forgiving margins of error, but the danger of making a Type 1 error is drastically more heinous than a Type 2. So boys and girls, please check your functional form before concluding your regression.
Our great mates to the south, Emperor Penguins, had been the Christian masthead of serial hetero-monogamy.

We must be true to ourselves and claim the rights and privileges inherent in this market of love. If your FDI outflows exceed your own net worth, then you deserve more return on your emotions! Competition too high? Devalue your currency and attract capital investment! Worried about the downsides of autarky? Privatize, decentralize, and deregulate yourself to improve comparative advantage! Just remember, if you want to make your own black beans, you must intensify production and give incentives to the black-bean makers. The same applies to love. When you want the satisfaction of attention from members of the fair sex, you must strategize, capitalize, and aim to monopolize.
In conclusion (not nearly), further attention must be devoted towards natural 'scientizing' love with a potent force of analytical rigor and finesse. Then we might come closer to accepting our own inclination to rationalize love as an amalgam of characteristics and social conditions which weigh into the decision of whom to procreate with, how often, and for how long. And as Roy and Silo have demonstrated, let us not delude ourselves into believing that the answer to 'how long' is a given.