[quote=@Sep]
Yes because all the Jedi are going to go romancing Sith, or falling in love and finding ways to make it obvious while in prison. And a little is all right, a lot isn't. Also Tahiri went borderline dark more upon Jacen corrupting her ideals than her love for Anakin and it was in fact her love for Anakin that brought her back after she realized what she'd done.
[/quote]
After turning her back on her own traditions and ideals,[sup]1[/sup] murdering Pelleon in Darth Caedus's name,[sup]1[/sup] and becoming a slut for him[sup]2[/sup] all because of a manipulation based around Darth Caedus using his 'flow-walking' ability to allow her to see Anakin again, but only for short periods each time. I'd say that's a case for a win when it comes to a Sith manipulating love in order to turn someone against their true nature.

If Darth Caedus hadn't been foolish enough to make Tahiri think that his 'flow-walking' would be able to physically change the past then Tahiri would've likely continued being his apprentice, and fuck toy, until she truly lost herself to the Dark.

[indent][indent][sub]1: [url=http://starwars.wikia.com/wiki/Legacy_of_the_Force:_Revelation][i]Legacy of the Force: Revelation[/i][/url]
2: [url=http://starwars.wikia.com/wiki/Fate_of_the_Jedi:_Allies][i]Fate of the Jedi: Allies[/i][/url][/sub][/indent][/indent]

And it wouldn't be a case of Jedi romancing Sith, but the other way around. A wily Sith would use physical temptation in order to lure the unsuspecting Sith over to the Dark Side. This is a strategy used in real world brainwashing and neural programming after all, even without needing the Force to back it up.