Yummy breasts - right?
Any idea what natural female pheromones are present for a non-lactating, adult woman?
This question came to me late one night 
Dunno but I could foresee a lifelong hands-on research project here! 
There seems to be a pheromone secreted that makes babies suck for food according to the ted talk below that shows it working on a sleeping baby when the droplet from the breast area was placed above the baby’s lip…
Playing with them especially the nipples releases oxytocin internally in the woman causing potential bonding effects for the child/mother or woman to lover.. More then likely seems to be causing similar bonding effects to us and always willing to test these theories out vasopressin seems to be the male equivalent of oxytocin for effects on males. So now you know why foreplay is important… Touching skin and gazing into the eyes also releases Oxytocin, as well as after sex.
Suckling a woman’s nipples has worked very well for me as an arousal technic on women.
Personally, I find it irritating when done to my nipples. But women project.