Refractory period (sex) for treating sexual dysfunction. Sildenafil, used in the treatment of erectile dysfunction, was found in one scientific study to have caused "a decreased postejaculatory erectile refractory time (3.2 ± 0.7 vs. 6.4 ± 0.7 minutes)" in men diagnosed with premature ejaculation. It is additionally proposed that the gonadotropin inhibitory hormone (GnIH), which is considered to inhibit the hypothalamic-pituitary-gonadal axis and sexual functions causes refractoriness of the post-ejaculatory refractory period. This hypothesis also supports the increase of oxytocin and prolactin after orgasm in accordance with the previous studies. One alternative theory explains the male refractory period in terms of a peripheral
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