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A: Copulation is the most direct possible interaction between males and females, but we know so little about it largely due to the physical challenges of studying it, especially with underwater creatures. We do this by looking at tissue samples from animals that died of natural causes. We use whole penises and whole vaginas.

A: Yeah. We found a way to inflate them so they would be the most close mimic of what a real intromission would look like. The bottlenose dolphin's vagina, seen here in gray, contains a of intricate folds and flaps which the male's penis red must navigate if he is to deposit his sperm as close to the egg as possible. A: We used pressurized saline, so essentially we had a nitrogen tank and we filtered the air under pressure into a smaller keg—like a beer keg—which was full of saline, and then pumped that into the penis.

Is it going to be relatively simple? Or will there be these spirals? Or will there be deep folds?

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Or shallow ones? Some species, like dusky dolphins, copulate belly to belly. Bottle nose dolphins seem to make a T-formation, where the male crosses the female exactly at her midline. Harbor porpoises are really unique in that they wait for the female to come to the surface of the water to take a breath and then they leap out of the water and try to hook her with their penises.

A: This is what the whole purpose of the research is to understand. They have sex all year round even when they can only conceive for certain periods of the year. By looking at how the genitals align, we can now say certain body positions are more likely to lead to successful fertilization than others, which might be for purposes other than reproducing. Is it play?

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Is it working out hierarchies? Is it establishing dominance? Is it learning? There could be many functions of sex. A: I think the best thing is how exciting it is. It seems like the sky is the limit. By Elizabeth Pennisi Jul. By Warren Cornwall Jul.

By Mennatalla Ibrahim Jul. All rights Reserved. Bottlenose Dolphin Tursiops truncatus swimming in Hawaii.

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