Handedness and sexual orientation are in no way comparable.  People aren’t in the closet about being left-handed.  No one tries to pass constitutional amendments preventing left-handed people from getting married.  There aren’t thousands of websites for “left-handed curious” people.  
 There are a lot of people out there who have had homosexual/bisexual experiences who are not homosexual/bisexual or do not identify as such.  
 Sexuality is such a sensitive subject that no label should be used without incontrovertible evidence or an admission from the person in question. 
 Let’s not forget also that the magazine that this quote was mentioned in has a biased interest in hyping lesbianism.  Loken could have just as easily been making the comment for shock value or because she has been bi-curious in the past.