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 delivery and increases comfort" for expecting mothers. The position of the birthing chair allows muscles(including vaginal and abdominal as well as those in the back, stomach, legs, and arms) used in childbirth to work to efficiency. Since the 1980s many hospitals have begun installing birthing chairs due to the large number of inquiries about them. A modern birthing chair/stool can be made of many different materials including PVC inflatables such as the CUB support, plastic such as the Kaya stool and padded wooden stools. More recently birthing chairs/stools have been made to accommodate several upright positions such as squatting, all