In addition to the sensual pleasure, women have reported feeling more feminine while producing milk and continue with lactation for emotional or sensual reasons after weaning a baby.
This is the act of breastfeeding adults for pay (not to be confused with breastfeeding infants or babies for pay, i.e.: wet nursing).
One hypothesis postulates that the breasts grew as a frontal counterpart to the buttocks when primates became upright, thus attracting males, a theory first developed in 1967.
Practitioners sometimes refer to themselves as being in an adult nursing relationship (ANR).
Two persons in an exclusive relationship can be called a nursing couple.
Erotic Lactation between partners or an Adult Nursing Relationship (ANR) may develop from natural breastfeeding of a baby.
During the lactation period the partner starts to suckle on the female breast, and continues after the baby is weaned off.
She may have difficulty beginning lactation, so she supplements the infant's suckling with that of a partner.