Labels are a weird thing in general - I did say on here a long time ago that we would do better advertising ourselves as "person with vagina seeking person with penis" because that's all it really amounts to.
Before the hetroflexible label became an option here, I went by bi-curious because I do play with women as part of a group but don't actively seek them out to have sex with. To my mind, I could only really consider myself fully bi if I were interested in having one-to-one meets/relationships with women - I'm really not, therefore bi-curious was always the next best thing. Plus to call myself bisexual is kind of misleading if I meet up with a m/f couple who are expecting me to be as full-on with the female party as the male.
Hetroflexible is a much better option for me - it kind of says "As long as there's a dick available to me, I will go down on a girl for a bag of peanuts" (I know, I'm kinda cheap!) I guess if I were creating my own label it would be something like cock-centric bisexuality. But hetroflexible is much more user-friendly!