Given oxytocin is a medication you would need a script
It's used in childbirth to induce labor and in Breastfeeding milk let down reflex have no idea how it would benefit you during sex
Sorry to be a wet blanket but like most drugs this one should only be used when necessary and under medical advice. Is it really worth jeopardising your health for, possibly, a slightly better bang?
I had read that Oxytocin is a hormone produced after childbirth - helps mum and bub to bond, the mum to forget the pain and brings on lactation. Has same affect when feeding.
In Adult Nursing Relationships it increases feelings of intimacy between the couple. Sounds interesting if used as a spray. I'd prefer to feed as part of a massage to produce it ;-)
Oxytocin is a hormone that is made in the brain, in the hypothalamus. It is transported to, and secreted by, the pituitary gland, which is located at the base of the brain.1
In chemistry, oxytocin is classed as a nonapeptide (a peptide containing nine amino acids), while its biological classification is as a neuropeptide. It acts both as a hormone and as a brain neurotransmitter. Source: http://www.thisrelationship.com/happiness-weapon-of-seduction/