Intestinal parasites are a sexually transmitted disease. https://pubmed.ncbi.nlm.nih.gov/19653954/ https://pubmed.ncbi.nlm.nih.gov/19653954/ It's possible tha

Intestinal parasites are a sexually transmitted disease. https://pubmed.ncbi.nlm.nih.gov/19653954/ https://pubmed.ncbi.nlm.nih.gov/19653954/ It's possible that some men who sought out a life of close confinement with other men might have a proclivity for behaviors which might result in parasite transmission.