Love is the theme of innumerable songs, films, books, and other literary and artistic creations, and it permeates our popular culture. But when we experience love, what physiological changes take place? 
Though hard to pin down, love can be summed up as a strong, profoundly affectionate sensation. Science views love as essentially a concoction of chemicals that the brain releases. 
Evolutionarily speaking, the desire for favored mates is a basic animal impulse that gave rise to romantic love. In order to bring children through infancy, love keeps people connected and devoted to one another. This guarantees that our species will procreate, endure, and flourish indefinitely. 
Romantic love, however, is more than only procreation. Some contend that, like hunger, thirst, and sleep, love should be viewed as a motive.

Upon first falling in love, what happens? 
When one begins to regard another as exceptional and different, usually, love blossoms.
A strong neurological condition marked by intense emotions and heightened reflexes is the first stage of falling in love. The hormones responsible for sexual activity, testosterone and estrogen, are responsible for lust and attraction. 
Falling in love causes certain parts of the brain to become active, specifically the reward centers and limbic system. For emotion and memory, the limbic system is crucial. That's why the memories of new love are so vivid and why it makes you feel good.

How does a passionate love evolve over time? 
For several months, there is an intense infatuation and falling in love phase.
There's more closeness, commitment, and attachment in the following phase. This is caused by the chemicals vasopressin and oxytocin. After the first spike in cortisol and tension caused by the unknown and danger of falling in love, oxytocin helps us feel comfortable and secure. Vasopressin stimulates self-protective, territorial, and alert behaviors. 
There is a balance between connecting with others and safeguarding both yourself and the person you are in love with between oxytocin and vasopressin. 

And non-romantic love? 
Beyond its function in romantic love, oxytocin has a vital role in all types of love, including relationships with friends, family, and even pets. Human health, happiness, and longevity are greatly enhanced by oxytocin and positive social interactions.
In bed, someone pats their cat. 
Our affection for pets is influenced by oxytocin as well. Unsplash/Christopher Abney 
According to our research, oxytocin is linked to both individuals with and without depression having higher quality of life and stronger social relationships. 
That being said, enjoy loving and being loved for as long as you can, for the love of your favorite person, persons, or pet(s), whoever they may be, and as many times you fall in love. 
The finest chemical concoction found in nature may be love. However, all the nuances.