Orgasm men are capable of achieving them is supported by men who have reported having multiple, consecutive orgasms, particularly without ejaculation. Males who experience dry orgasms can often produce multiple orgasms, as the refractory period is reduced. An increased infusion of the hormone oxytocin during ejaculation is believed to be chiefly responsible for the refractory period, and the amount by which oxytocin is increased may affect the length of each refractory period. Another chemical which is considered to be responsible for the male refractory period is prolactin, which represses dopamine, which is responsible for sexual arousal. Because of this, there is
Human milk microbiome in mature milk. Taxonomic composition of human milk also varies across the lactation period, initially dominated by "Weisella, Leuconostoc, Staphylococcus, Streptococcus," and "Lactococcus" species, and later composed primarily of "Veillonella, Prevotella, Leptotrichia, Lactobacillus, Streptococcus, Bifidobacterium," and "Enterococcus" Human milk oligosaccharides, a primary component of human milk, are prebiotics which have been shown to promote growth of beneficial "Bifidobacterium" and "Bacteroides" species. Mode of delivery may influence composition of the human milk microbiome, vaginal births being associated with high taxonomic diversity and high prevalence of "Bifidobacterium" and "Lactobacillus," and the opposite trend being seen with Cesarean births, however, no relationship between