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Med Hypotheses. 2015 Dec;85(6):976-85. doi: 10.1016/j.mehy.2015.09.002. Epub 2015 Sep 6.

Support for the hypothesis that sexual breast stimulation is an ancestral practice and a key to understanding women's health.

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Cleveland State University, United States. Electronic address:


Women's health is seriously impacted by sexual dysfunction, mental depression, breast cancer, and gynecological cancers. Breast feeding has been found to reduce the risk of in-situ cervical cancer, endometrial cancer of the uterus, ovarian cancer, and breast cancer. This protective effect of breast feeding supports the notion that another functional use of the breast, sexual breast stimulation, promoted by women to incite their sexual arousal and orgasm, is a practice which also reduces the risk of these same cancers, and protects against sexual dysfunction and mental depression. The significance of the practice of breast sex or "sexual breast love" lies with its deeply rooted past in the founding of our species, Homo sapiens. No other species exhibits breast sex, a human cultural activity that is implicated in women's desire, sexual satisfaction, and the development of human sociality. For species females as a whole, nipple stimulation by a partner during sex, over the adult life of a female, has occurred since the inception of H. sapiens, so that the failure to engage in this activity is counter to a species typical practice and endangers women's health. Breast sex results in nipple erection, and may micmic the effects of breast feeding, causing an increase of oxytocin in the body. Breast sex is an enriched type of sexuality that enables love between the sexes and the pair bond. The intimacy of breast sex creates a common ground of sexual knowledge, allowing empathy, cooperation, commitment, and communication. It induces reciprocity and therefore happiness. With breast sex, there is an increase of the positive emotions over the chimpanzees, promoting advanced cognition. Research into whether oxytocin release is caused by stimulation of the breasts in non-lactating women is inconclusive, but cultural studies demonstrate that breast stimulation induces sexual arousal, and research has shown that sexual arousal is associated with oxytocin release.

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