Nope.
Sexuality is analog, not digital. It’s a continuum with hetrosexual at one end and homosexual at the other (and those lovely asexuals just sitting somewhere else enjoying watching the party). As much as you appear to want to label people and put them in boxes, it’s just not that simple. We’re talking about relationships and sexuality here, not which breakfast cereal you like best.
The reality is you just can’t say how another human being is going to affect you, so to completely and utterly dismiss the possibility you might even IMAGINE something sexual with someone of the same or opposite sex. Well that’s getting pretty damn fundamentalist, don’t you think?
Take the
Epstein Sexual Orientation Inventory test for example. You’ve got to work really hard to score a 0 or a 13 in it, trust me. In fact, find out for yourself, you can take it here: http://mysexualorientation.com/

That’s my score by the way. 2.5 and PROUD baby!
‘Bi’ is the beautiful all encompassing everyone’s included catch-all category, where everyone but the extremists can happily float around without guilt, don’t dis it. Sure, you may identify yourself as straight or gay or whatever but really, the reality is you’re very likely to be a little bit ‘bi’ – and that’s okay.
What’s most important, in the legendary words of Blur:
“Girls who are boys
Who like boys to be girls
Who do boys like they’re girls
Who do girls like they’re boys
Always should be someone, you really love”
Plus it was a joke, written in a fantasy, about how people act when they’re drunk.
Lighten the fuck up