Cross references:  Oxytocin      Oxytocin Receptors     Oxytocin Receptor Distribution   

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Vasopressin (Wiki)   
    "Vasopressin, also known as arginine vasopressin (AVP), antidiuretic hormone (ADH), or argipressin, is a neurohypophysial hormone found in most mammals. Its two primary functions are to retain water in the body and to constrict blood vessels. Vasopressin regulates the body's retention of water by acting to increase water absorption in the collecting ducts of the kidney nephron.[1][2]"  
Most of it is stored in the posterior pituitary to be released into the bloodstream. However, some AVP may also be
released directly into the brain, and accumulating evidence suggests it plays an important role in social behavior,
sexual motivation and pair bonding, and maternal responses to stress. It has a very short half-life between 16-24 minutes.[2]"