a woman's mouth, lips and tongue may be sensitive erogenous zones; they are commonly used by partners during the preliminary stages and throughout a sexual activity, whether for kissing, sucking, licking or specifically for oral sex. the stimulation of a partner's breasts, including oral or manual stimulation of the nipples, is a form of foreplay. breast and nipple stimulation of women is a common aspect of sexual activity. the stimulation of a woman's nipples promotes the production and release of oxytocin and prolactin. during the stimulation of the nipples, large amounts of oxytocin are released, which would normally prepare the breast for breastfeeding. besides creating maternal feelings in a woman, it also decreases her anxiety and increases bonding and trust.