Wasn't that the oposite? This is kind of amusing since it's implied in the anime that they had sex.
No, in fact there were several scenes in the manga where she actually does this in a subtle way.
In the manga, I'm not entirely sure that Saeko is all for Takashi. She'd probably be more in it for the primal feelings of sex than for being loved by someone. I'm not saying she's a loose woman, but she's more about instict and bushido then romance.
I think there is more to it than that. Like I do with NaruSaku, I look at the subtle hints and there is a lot to suggest otherwise. I mean, you say it is because of this warrior instinct, but wouldn't she be that way with Kouta too....or with any guy in fact? I don't think she is that shallow. I also look at common sense moments in that if Saeko had no feelings for him what so ever then why does she constantly blush around him or why does the artist always imply these heavy emotional scenes with them two?
One could argue it is hormonal balances and stuff, but this could also applied to Rei. Especially when it shows her going on and on about Hisashi to Takashi and gets mad at him when he starts feeling angry cause he is always being compared. This is what doesn't sit right with Rei to me. She says she loves Takashi, but she keeps going on and on about Hisashi. (Which ironically many have the same problem with Sakura doing this to Naruto.)
Rei is kind of selfish and shallow because it is looking like she is only going with Takashi because Hisashi isn't around. I don't know if this is true or not, but it's just how the writer made it seem.
There was this scene that takes place that kind of implies something. Nothing i really specific, but I think we all know what it is. (I am taking a picture straight from my omnibus.)
I want to treat this the same way I do NaruSaku and say that this scene is implied in a way that cnt mean anything else than the obvious. Just like the scene with Yamato, you can't put just anything here because the matter doesn't make sense. Why would Rei get mad if it was something different and what doe Saeko and Rei have in common? Takashi. We also have the story later on about Saeko having a crush, but unable to tell him. Again, you could argue something different, but I am going to go with my gut instinct and say it is the more obvious answer.
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Takashi probably would've ended up with Rei as it's usually the first girl to show up who wins in the end.
That's not always true. Look at Fruits Basket, Yuki was the first on the scene, yet Tohru ends up with Kyo. Look at Evangelion where Shinji first meets Rei, but heavy implied to end up with Asuka.
Maybe this would be easier
http://tvtropes.org/...in/LastGirlWinsand we also have this one which is interesting.
http://tvtropes.org/...tConfessionWins