To cut the perineum without medical necessity was, in the emerging 1981 view, to sever the anatomical bridge between reproductive sex and pleasurable sex. If 1981 redrew the anatomy of the mother, it also finally acknowledged the father’s hormonal body. Previously, fathers were relegated to waiting rooms. But the bonding studies of the late 1970s, hitting mainstream consciousness in 1981, showed something remarkable.

We are, each of us, born from an act of love (or at least, an act of sex). And we spend the rest of our lives seeking a love that feels like that first, primal safety—the warm, rhythmic, oxytocin-soaked memory of being held skin-to-skin, hearing a heartbeat, and knowing, before language, that we are safe.

The perineum, the 1981 anatomists argued, is designed to stretch. Its collagen fibers, under the influence of the hormone relaxin (discovered decades earlier but fully characterized by 1981), can become pliable. A perineum that stretches naturally during birth—lubricated by blood, sweat, and amniotic fluid—retains its innervation (nerve supply). That innervation is precisely what allows for the exquisite sensitivity of the vaginal introitus during intercourse.

In the vast library of human understanding, certain years act as pivot points—moments when a cluster of ideas coalesces into a new paradigm. The year 1981 stands as one such landmark. It was a year wedged between the free-love ethos of the 1970s and the AIDS-conscious sobriety of the mid-80s. Yet, beneath the surface of political shifts and pop music, 1981 witnessed a quiet revolution in how we understand the most fundamental acts of human existence: Birth , Love , and Sex .

For the infant, the breast is the first exteriorized object of love. The rooting reflex, the suck-swallow-breathe sequence, and the eye-gazing that occurs during breastfeeding—all of these are the infant’s first lessons in attachment. The 1981 model suggested that disruptions in breastfeeding (due to separation, pain, or formula) could create a template for insecure attachment in adult romantic relationships. Not everyone agreed. The medical establishment of 1981 was still wedded to the "twilight sleep" (scopolamine-morphine) generation of the 1950s. Many doctors dismissed the "anatomy of love" as romantic nonsense. They argued that birth was a pathological crisis to be managed, not a sexual event to be honored.

When a father holds a newborn skin-to-skin immediately after birth, his prolactin levels rise. His testosterone drops slightly. His oxytocin increases. In other words, the anatomy of a father’s love is not a social construct; it is a physiological response triggered by the smell, sight, and touch of the infant.

That is the anatomy of love. Discovered, articulated, and championed in 1981. And still true today.

This had direct implications for the couple’s sexual relationship. The 1981 sex therapists noted that couples who birthed together (with the father as a calm, informed coach) reported re-establishing intercourse faster than those from whom the father was excluded. The shared trauma-to-triumph of birth became a form of "limbic bonding" that deepened marital sex. In the anatomy of love, the breast is the most polyvalent organ. In 1981, the debate over breastfeeding was at its most politicized (the first WHO code on marketing breast-milk substitutes was adopted that year). But the anatomy was clear.