Dating lactating women
According to the book Body parts: critical explorations in corporeality, adult nursing may occur when an "individual, usually a mother, may choose to continue lactating after weaning a child, so that she avoids the significant physical challenge that inducing lactation can entail." However, milk production can be "artificially" and intentionally induced in the absence of any pregnancy in the woman.
This is called induced lactation, while a woman who has lactated before and restarts is said to relactate.
Erotic lactation between partners or an adult nursing relationship may develop from natural breastfeeding of a baby.
She may have difficulty beginning lactation, so she supplements the infant's suckling with that of a partner.
Or there are cases where breastfeeding was interrupted for an extended period of time as a result of infant prematurity, infant absence, or mother's illness (taking prescription medication).
Some women lose the ability to be aroused while breastfeeding, and thus would not find lactation with a sexual partner to be erotic.
This can be a result of physical reasons (soreness) or psychological reasons (conflicted about her breasts being used other than for an infant).