What an absolutely disg- charming creature.It is said that whether yukkuri is male-type or female-type depends on her living environment.Yukkuris can breed in any way that creatures can.but some people also think that since a lot of primitive creatures are androgynous, it is just because yukkuris didn't evolve at all.Yukkuris are androgynous.
It is said that the weak yukkuris did evolve into this for multiplying, Erection
Sperm pastes which come from body secretion will be released through the tube
The hole for urination, or "pee-pee", will be closed during erection.
This configuration makes pee-pee comes out via peni-peni, too.Non-erection
Acts as female genital, known as "mamu-mamu"
Male-type stimulation will make this organ protrude from yukkuris' body, showing the normally-hidden male genital, known as "peni-peni"
There are slight differences between male-type stimulation and female-type stimulation, and they can be told when a yukkuri switches her stimulation type.