Te, but she has also explicly stated that she was gay. She even had to plan to turn RJ to a female 'Him'. If she were bi, she wouldn't have need...
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AFTER OZ LEFT WILLOW, WHY DID SHE BEE GAY AND NOT BISEXUAL?
Willow and Tara were not the first on-screen lbian uple, or first gay characters on work TV (Will & Grace was s third season at the time) however the work imposed tight rtrictns on the timacy the uple uld exprs even though there were several timate scen between the heterosexual upl of the show.