I absolutely agree with you that the term is problematic. Even homosexual and heterosexual in
human social context are problematic: Homo meaning same is applied to men who have sex with men, because we have sex with the same sex as ourselves; heterosexuals have sex with the other sex to themselves. But in social play, homosexuals are regarded and objectified as "other," or hetero, while in this same context of social intercourse or play, heterosexuals are treated as being "the same," or homo to each other, being in the majority. So we end up with an inversion of the language, both being 'right,' but in differing circumstances. Neither instance in this example should give reason to feel offence, as it is merely an observation of social politics in action and the verbal representation of that interplay.
However, homosexual, heterosexual and bisexual, as well as asexual are words that apply to all living organisms, regardless of whether they be plant, fungi, animals (people are animals), bacteria or virus. Have I missed anything? They are not ever inferred to relate only to legal adult human being status, and to suggest so is a little bit of a stretch.
"Sex," is not, as many bureaucratic forms seem to suggest, addressed by the word "gender;" although the number of sexes is limited - ie. Male/Female/& today we accept Male to Female Transsexual, and/Female to Male Transsexual. Gender refers to the social roling of the various sexes, or the expected behaviour of a person of particular sex (yes, I know, you know this already...

), and the number of genders is also generally limited to the notions of simply the most obvious two, male and female - however glib or facile this may seem to some very dexterous and detailed minds. While sexual attraction may involve gender assessment and recognition, it may also involve sex (the...of the object of desire), and any number of other attributes. (Transgender speaks to a person changing the way that they behave in relation to the social expectation of their sex, so that a transgender woman may dress and behave in what is recognised in her social order as being the behaviour and dress of a typical man, to the point that it is noticeable by others in that social context. It does not necessarily speak to that person's sexuality, or to their sexuality alone either.)
These two words, "pan" and "sexual," literally mean, "all," (
not "
all genders", with no hint of
genus) and "sexual." There is no ambiguity, and there is no hint of reference to "people," except in the clear context of the initial questioner asking for a definition of the term as it relates to people, let alone "people meeting particular criteria." If one infers from this term that such meaning exists, whether that inference be encouraged through context such as the tone or colour another speaker or writer uses when introducing the term to one or not, one over-generalises. The inference is incorrect. There is no rudeness nor malice expressed or implied; it simply means as it means. Pansexual speaks to
universally inclusive sexuality. If we need other words to descibe the various shades of human sexuality that relate to the experiences and expressions that some here have denoted as how they understand/stood "pansexual," so be it - find different or build new language; that is what seperates our language from dead languages such as Ancient Greek and Latin, which will never come to be defined differently legitimately. I do not make the rules, but I do respect them and adhere to them so that
most people will understand me fairly well. This is not intended to be insulting to anyone.