I've been wondering this myself recently, well not the bicurious part - I didn't realise that was now officially classed as an ID (I originally came across the term in a comic book when I was around 15 and it's been thrown around ever since but I didn't know it was an accepted ID). it's good that it is though as it may just fit a friend of mine who is struggling with coming out, she's not entirely sure where she is on the spectrum of sexuality as it were.
I have been wondering about my own identity though. I'm a lesbian, this much I know - men, while fun to hang out with, are just not what I'm into. I had a couple of boyfriends in the past and while they were good guys, it always felt so wrong for me on many levels, even in terms of expected behaviours like letting them open a door or suchlike. I always identified as a 'tomboy', before I ever realised that being gay was a thing. I have been described as 'chivalrous', 'a gentlewoman' and 'charming' in the past all of which made me smile, but then again I have long curly red hair (though to be honest it's not especially styled, it's messy and suits my personality) so maybe I'm not on the butch spectrum either.
My question is - what is the difference between a soft butch and a tomboy if there is any?