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using REFbook key ISBN
|location=Dubuque, {{USSC|IA}}
|publisher=William C. Brown Publishers
|isbnISBN=978-0697056757
|date=1989
|pages=935-6
|title=Reproductive Physiology of Marsupials
|publisher=Cambridge University Press
|isbnISBN=978-0-521-33792-2
}}</ref><ref>{{REFbook
|last=Hyman
|publisher=University of Chicago Press
|pages=583–
|isbnISBN=978-0-226-87013-7
}}</ref><ref>{{REFbook
|last=Jones
|title=Predators with Pouches: The Biology of Carnivorous Marsupials
|publisher=Csiro Publishing
|isbnISBN=978-0-643-06634-2
}}</ref><ref>{{REFbook
|last=Saunders
|title=Marsupial Biology: Recent Research, New Perspectives
|publisher=UNSW Press
|isbnISBN=978-0-86840-311-3
}}</ref> which is not homologous to the scrotum of placental mammals,<ref>{{REFbook
|last=Armati
|title=Marsupials
|publisher=Cambridge University Press
|isbnISBN=978-1-139-45742-2
}}</ref>
although there are several marsupial species without an external scrotum.<ref>{{REFbook
|title=Life of Marsupials
|publisher=Csiro Publishing
|isbnISBN=978-0-643-06257-3
}}</ref> In humans, the scrotum may provide some friction during intercourse, helping to enhance the activity.<ref>{{REFbook
|last=Jones
|publisher=Academic Press
|page=74
|isbnISBN=9780123821850
|quote=The rear-entry position of mating may allow the scrotum to stimulate the clitoris and, in this way, may produce an orgasm ...
}}</ref>