Erotic lactation is arousal by breastfeeding on a female's breast. Depending on the context, the practice can also be referred to as breast suckling, adult nursing, sexy breastfeeding, or adult breastfeeding. 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, from which there are many benefits of doing so. It is sometimes considered taboo currently because a man suckling on a female breast is in contradiction to well established images of masculinity.

Erotic Lactation between partners or an Adult Nursing Relationship (ANR) may develop from natural breastfeeding of a baby. During the lactation period the male partner starts to suckle on the female breast, and continues after the baby is weaned off. Milk production is continually stimulated and the milk flow continues. However, milk production can be intentionally induced in the absence of any pregnancy in the woman. This is called Induced lactation, while a woman who has lactated before and re-starts is said to relactate. This can be done by regularly sucking on the nipples (several times a day), pumping, massaging/squeezing the female breasts or with additional help from temporary use of milk-inducing drugs, such as Domperidone.

In principle - with considerable patience and perseverance - it is possible to induce lactation by sucking on the nipples alone. Herbs will not induce lactation; they will only increase production once it is established. It is not necessary that the woman have ever been pregnant, and she can be well in her post-menopausal period. Once established, lactation adjusts to demand. As long as there is regular breast stimulation, lactation is possible. Once lactation is established, herbs may be used to increase production. These include Fenugreek (the most popular), blessed thistle, and red raspberry leaf.