Florian Möllers / Female Chimpanzee (Pan troglodytes schweinfurthii) "Lola" (18 years) sitting in rainforest tree, large genital swelling. Budongo Forest Reserve, Masindi, Uganda, Africa. December

Florian Möllers / Female Chimpanzee (Pan troglodytes schweinfurthii) "Juliet" (16 years) with large genital swelling, calling. Budongo Forest Reserve, Masindi, Uganda, Africa. December

Doug Perrine / Close up of throat pleats, navel, genital and anal openings, and mammary slit of Bryde's whale (Balaenoptera brydei /edeni) as it passes photographer as it charges through a small school of Sardines,...

Roland Seitre / Orca (Orcinus orca) female genitals, Spain

Fabio Liverani / Purple crocus (Crocus angustifolius), Emilia Romagna Region, Italy

Flip Nicklin / Humpback Whale (Megaptera novaeangliae) genital slit, Maui, Hawaii - notice must accompany publication; photo obtained under NMFS permit 987

Gabriel Rojo / Guanaco (Lama guanicoe) female, sniffing her calf's genital area in recognition, La Pampa Province, Patagonia, Argentina.

Gabriel Rojo / Guanaco (Lama guanicoe) female, sniffing her calf's genital area in recognition, La Pampa Province, Patagonia, Argentina.

Doug Perrine / Hawaiian spinner dolphin (Stenella longirostris longirostris) pod, with male performing genital buzz courtship behaviour on female. A shoal of Black durgon triggerfish (Melichthys niger) swimming behi...

Doug Gimesy / Grey-headed flying-fox (Pteropus poliocephalus) male licking female genitalia, followed by mating and male genital cleaning, Yarra Bend Park, Fairfield, Victoria, Australia, April.

Christian Ziegler / Bonobo (Pan paniscus) females engaging in genital rubbing, Kokolopori Bonobo Reserve, Democratic Republic of the Congo

Pete Oxford / Dani tribe man with penis gourd / koteka. Budaya village, Suroba, Trikora Mountains, West Papua, Indonesia. October 2020.