“You've got the first law, a testament to bookkeeping, where explicit in equations like dU=dQ-dW is the idea that what you'll get out (a relationship) is directly determined by what you put in (to a relationship).

Then, of course, there is the second law - a statement on the notion of entropy, often laymanized (is that a word?) as a reflection of "disorder." (I don't think anyone would argue about the disorderly nature of love).

Finally, you have the third law, which addresses the thermodynamic principle of absolute zero - a place where everything stops, and presumably a bad place to be in a relationship. Anyway, a bit of a stretch I'll admit, but song lyrics are great outlets for metaphorically attuned stretches, right?”