New research published in the Archives of Sexual Behavior reveals that couples experience synchronized rises in oxytocin, the love hormone, in the 40 minutes after sex. The study was conducted with couples in their own homes, offering a fresh look at how intimacy biologically strengthens bonds in romantic relationships. For Thai audiences, the findings resonate with ongoing conversations about relationship well-being in health education and public discourse.
Oxytocin is produced in the hypothalamus and released by the pituitary gland. It is linked to emotional closeness, trust, and social bonding. Unlike earlier laboratory studies, this research captured hormonal shifts in private, real-world settings. Couples performed intimate activity in familiar environments, while saliva samples were collected at four time points: before sex, immediately after, 20 minutes later, and 40 minutes later. The sample included 49 mixed-sex couples in monogamous relationships, ages 18 to 31, with diverse backgrounds, primarily recruited from the United States. Results showed that overall oxytocin did not spike dramatically, but patterns differed by gender and became synchronized between partners at 20 and 40 minutes after sex.