Sex needs to be defined more clearly.
At a cellular level, there is only two types of gametes: male and female. Sperm or egg.
No spectrum here at all.
At a chromosome level, this typically involve two combinations: XY and XX
There are anomalies, but the vast majority of individuals are one or another. And the other combinations still only yield male or female gametes (no third gamete option)
At the individual level, typically you will have the ability (at some point in your life) to produce male gametes, or female gametes (and the type of gametes you can produce will not change, the only thing that changes is that the ability switches on, then off)
Again there can be anomalies (no gametes, or, very rarely, both??), but they're the exception, not the rule (just like some people are born with missing limbs or extra limbs)
Then there's the wider phenotype... Primary sexual characteristics (your genitals) are often clearly male (penis + testicles) or female (vulva + vagina + uterus + ovaries). And this typically matches the gametes you produce.
But sometimes these organ can be malformed, mixed up, duplicated... So for instance, one can produce male gametes (internally) but have female looking external genitals (but no womb/ovaries). And some people may appear to have both sets! (not necessarily fully functional), etc. That's intersex people, they exist, they are quite rare. At the end of the day, still only two types of gametes.
Then there's secondary sexual characteristics, which are ruled by hormones, and quite messy. Hairiness, boobs, voice, height, body fat, temperament, ... All of these can be influenced by hormones such as oestrogen and testosterone. Traditionally these hormones have been viewed as female and male hormones, but that's misleading as males and females produce and need both, just in different amounts. And the amounts varies during life, and across individuals, and the distinction between "anomalies" and "normal variations" is more blurry.
E.g. most females don't have beards... but lots of older women start growing some degree of facial hair once they reach menopause.
That bit could be seen a bit more like a spectrum. But secondary sexual characteristics are not really sex. Plenty of girls fail to grow sizeable boobs (yet can bear children), plenty of lads will grow moobs if they eat too much (yet can't bear children). The only secondary sexual characteristic that remain fairly constant (and a good predictor of the gametes you may produce) is the shape of your pelvis.