Another way a 2-argument function can become 1-argument is to become an OO method, e.g. global function "void likes(Person, Person)" becomes "class Person { void likes(otherPerson); }"

i.e. the first argument becomes the receiving object.

And this is what people are forgetting - that actions (such as attraction) are not disembodied things, rather there is always a thing that acts. OO makes it impossible to forget this.