That Sasami has begun menstruating is actually canonical.
I found out about this quite accidentally while I was doing research involving the 101 Fact About Tenchi Muyo. Of course, none of us can be blamed for not noticing. They were very, very subtle about it, but in Episode 8, Hello Baby (where Tenchi's baby cousin Taro comes over), we see that Sasami is uncharacteristically shy when she's coming back from their aunt's house. Also, while it's never really openly stated, it's also hinted that they're given a gift of Sekihan (red-bean rice) - which is eaten in celebration of a girl having her menarche.
As for how long it lasts... well, the bleeding can go on for several days. It varies from one woman to another. However, the truly debilitating part - the menstrual cramps - usually only lasts about a day.
EDIT: Oh, and as for alien physiology? Nope. Earth is a colony world for Jyurai, which is why it is in Jyurai's territory. It was settled by the sister of the First King of Jyurai and her entourage. Also, she's still alive. Her tree-ship is on the Moon and it's been preserving her soul. Doujin by Kajishima Sensei indicate that one of Tenchi's sons will eventually find her and marry her.
So, aside from some genetic markers to indicate heritage... Humans and Jyuraians are the same, save for a longer lifespan.
The only one that may have true alien physiology is Mihoshi. And even then I'm pretty sure there's been enough cross-breeding in their history that it's non-issue - instead you just get little peculiarities, like how all her people have dark skin, blue eyes, blonde hair, and elfin ears.
I found out about this quite accidentally while I was doing research involving the 101 Fact About Tenchi Muyo. Of course, none of us can be blamed for not noticing. They were very, very subtle about it, but in Episode 8, Hello Baby (where Tenchi's baby cousin Taro comes over), we see that Sasami is uncharacteristically shy when she's coming back from their aunt's house. Also, while it's never really openly stated, it's also hinted that they're given a gift of Sekihan (red-bean rice) - which is eaten in celebration of a girl having her menarche.
Quote:Tenchi: *Accepting the large bento from his aunt* "A gift? Is this to celebrate the baby's birth?"Final nail in the coffin? She stays up in her room for the entire adventure.
Aunt: *Smiles knowingly* "Well, something like that."
Ayeka: *Hiding a giggle behind her hand*
As for how long it lasts... well, the bleeding can go on for several days. It varies from one woman to another. However, the truly debilitating part - the menstrual cramps - usually only lasts about a day.
EDIT: Oh, and as for alien physiology? Nope. Earth is a colony world for Jyurai, which is why it is in Jyurai's territory. It was settled by the sister of the First King of Jyurai and her entourage. Also, she's still alive. Her tree-ship is on the Moon and it's been preserving her soul. Doujin by Kajishima Sensei indicate that one of Tenchi's sons will eventually find her and marry her.
So, aside from some genetic markers to indicate heritage... Humans and Jyuraians are the same, save for a longer lifespan.
The only one that may have true alien physiology is Mihoshi. And even then I'm pretty sure there's been enough cross-breeding in their history that it's non-issue - instead you just get little peculiarities, like how all her people have dark skin, blue eyes, blonde hair, and elfin ears.