Any kind of sexual stimulation drives up dopamine, which is associated with romantic love, and triggers other «feel good» hormones to wash over the brain. (wsj.com)
For instance, warm water in the shower can cause your milk to start, as can sexual stimulation from your partner. (howtoadult.com)
The most commonly recommended treatments for such issues include couples counseling, an increase in sexual stimulation, sexual education, sex therapy and finally, estrogen and testosterone therapies. (mic.com)