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'We were basically looking at two identical structures,' she says. Looking at the pairs, Orbach says she and her colleagues were struck by the tight fit. That included inserting each preserved penis into its matching vagina to scan, plus creating 3-D models of the interactions.

Then, the scientists set about understanding how each species' anatomy fit together. That gave the salt water enough force to push its way into each penis. She turned to the gas, nitrogen, that is pressurized to put bubbles in a Guinness or a nitro brew coffee. Colleague Diane Kelly, a biologist at the University of Massachusetts, realized she needed a way to pressurize salt water to pump into the penises.

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'It's full of tough elastin tissue, so it's very resistant to bending,' Orbach says. Not so in dolphins, porpoises, seals and their relatives. Those penises are encased by sponge-like tissue, which fills with blood to create an erection. That's trickier than it may sound, since the animals Orbach studies have, as she describes it, 'a very different penis type' from humans and many other mammals.

So, Orbach took casts of the vaginas and then the team needed to inflate the penises to mimic how they behave in live animals. The team wanted to see how the penises and vaginas fit together. Each animal's reproductive tract was cut out, frozen and shipped to Orbach and her colleagues to study. Orbach started by reaching out to a network of research and conservation scientists, requesting corpses of recently deceased harbour porpoises, common bottlenose dolphins, short-beaked common dolphins and harbour seals.