I can tell you for a fact people who are gay are not born that way. Every gay person I have known turned gay either because someone of the opposite sex abused them or because they started hanging around a bunch of gay liberals and wanted to jump on the bandwagon. Usually with men it is because a woman sexually abused them and usually with women it's because they are jumping on the bandwagon to be popular. Down vote me please bitches, make my day.
Well, if she's bisexual, she's hardly been 'straight' before, she just hasn't dated any women whilst she's been famous, or hasn't had her relationships with women discovered and publicised. It's perfectly possible that she's always identified as bisexual and has just never mentioned it. Has she said that she's a lesbian?
Also, not all gay, lesbian or bisexual people realise their sexuality whilst they're young. There are tonnes of older people who realise their sexuality later on, and she's only 25 years old, it's not like she's not young.
A lot of people deny their sexual orientations for quite some time, so it's totally possible that she just now became comfortable expressing it. And sure, it's also possible that the whole thing is a publicity stunt.
From where I sit, though, it doesn't really matter one way or the other.
That happens quite often, some people may try to disguise their true sexuality by dating and having sex with the opposite sex for fear of being judged negatively by peers and family, in Kirsten's case the general public and her fans. Just because it happened suddenly doesn't mean she's doing it for attention.
Well since I'm not KStew so I can't feel but if she's dating another woman (and Mrs. Stewart said this was true and basically outed Kirsten - Against her daughters will, actually, but nonetheless) then she is probably attracted to women
Of course I can't speak to her sexuality, but there ARE people who are bisexual who just haven't dated one sex or the other, yet or ever will. I have many gay and bisexual friends and know this to be the case. Some are afraid of being in a relationship with the same sex for whatever reason, then gain the confidence and be open about it. I'd say a lot of famous people do pull publicity stunts so I wouldn't rule such a thing out, though.