Many have known Oxytocin as a love hormone. Produced by Hypothalamus and released by pituitary gland which then released into the bloodstream.. Like antennas picking up a signal, oxytocin receptors are found on cells throughout the body.  
It's like a hormone of attachment and creates feelings of calm and closeness.

When you see your beloved, your brain releases dopamine, your serotonin levels increase, and oxytocin is produced. This causes you to feel a surge of positive emotion.

Pregnant women with higher levels of oxytocin during their first trimester bonded more strongly with their babies after they were born.

Not just for Mother and child but also for lovers. 
The more time you spend with your partner, the more oxytocin you produce; the more oxytocin you produce, the more you may desire your partner.
Summarized all of oxytocin’s possible relationship-enhancing effects. Some of these include:

trust
gazing
empathy
positive relationship memories
fidelity
positive communication
processing of bonding cues
relaxation
overall psychological stability

Oxytocin may help your body adapt to a number of different emotional and social situations.

This hormone is not limited to affection but have many wonders. 

Keep the fire burning Lovers! 




source: https://www.healthline.com/health/love-hormone#takeaway