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==Pheromones in humans== Pheromones are important in many animal species but, until recently, were thought to be unimportant in humans. <ref>{{REFjournal |last=Cohn |first= |init=BA |author-link= |etal=no |title=In Search of Human Skin Pheromones |trans-title= |language= |journal=JAMA Dermatology |location= |date=1994-08 |volume=130 |issue=8 |article= |page= |pages=1048-51 |url=https://jamanetwork.com/journals/jamadermatology/article-abstract/555981 |archived= |quote= |pubmedID=8053704 |pubmedCID= |DOI=10.1001/archderm.1994.01690080114018 |accessdate=2021-08-11}}</ref> It has now been shown, however, that the timing of ovulation in women can be controlled by pheromones from the armpit. This is believed to be the explanation of the fact that women living together will frequently develop synchronized menstrual cycles.<ref>{{REFjournal |last=Stern |first=Kahleen |init= |author-link= |last2=McClitock |first2=Martha K. |init2= |author2-link= |etal=no |title=Regulation of ovulation by human pheromones |trans-title= |language= |journal=Nature |location= |date=1998-03-12 |volume=392 |issue= |article= |page= |pages=177-9 |url=https://www.nature.com/articles/32408 |archived= |quote= |pubmedID=9515961 |pubmedCID= |DOI= |accessdate=2021-06-11}}</ref><ref name="collins2004">Pheromone. (n.d.) Collins Dictionary of Medicine. (2004, 2005). Retrieved June 11 2021 from https://medical-dictionary.thefreedictionary.com/pheromone</ref> Fleiss et al. (1998) reported that the moisture found under the foreskin contains pheromones.