Lol.. you are of course right about the love arguemnt. Love is likely ultimately derived from pair bonding, a valuable asset for species that must care for young for extended periods of time. Similar close relationships can often be observed in other animals, notably bird species like albatross.

Courtship in bird species can be highly complex and advanced, such as the bower bird of Australia. The bower bird build "bowers" or little nest like structures, and decorates them with shells, colorful stones, etc. This is all done to impress a female. volutionasrly speaking, I'm unclear on the selective advantage such courtship provides, unless it is to strengthen and cement strong bonds between mating pairs.

Human behavior is remarkably similar. Since birds and humans(and other mamals of course) are only VERY distantly related--at the amniote split bewteen the crown terapods 9this occured beofre modern reptilia and mammals), the pair bonding and courtship behavior must have evolved independently. This reinforces the idea that such behavior provides selective advantages.