Refractory period (sex) autonomic feedback mechanism, rather than through central chemicals like oxytocin, serotonin, and prolactin. Autonomic feedback is already known to regulate other physiologic systems, such as breathing, blood pressure, and gut motility. This theory suggests that after male ejaculation, decreased wall tension in structures such as the seminal vesicles leads to a change in the fine autonomic signals sent from these organs, effectively creating a negative feedback loop. Such a mechanism is similar to decreased gastric and bowel motility once gastric contents have passed through. Once the feedback loop has been created, the refractory period remains until the loop is broken
Birthing chair for women to lie on during delivery. A woman giving birth in the upright position has been seen in Asian, African, Pacific Islander, and Native American art. The concept of the birthing chair has also been written in observations by anthropologist as well as missionaries. As of the 1980s the birthing chair has been making a comeback in the modern medicine of childbirth. Some expecting mothers have reverted to the birthing chair for its upright position because it allows gravity to assist in the expulsion of the baby. Studies have shown that the birthing chair speeds up the time of