What does the phrase "sexual reproduction" mean, do you think? The implication, for humans, is the union of two unalike gametes. It doesn't matter what the phenotype of the respective participants looks like: if one produces the motile gamete (sperm), and the other produces the immotile gamete (ova), then you can reproduce. We describe the participants as having a "sex". We extend this to the situation where the participants might not be able to generate a gamete (through immaturity, maturity, or accident) by asking what sort of gamete they're set up to produce.

There's no spectrum of those gametes. There are just the two. If sexual reproduction - which is how evolution works its magic, which is how we got here - functions, it's through that union of the *just two* unalike gametes.

You can try to redefine sex. But it will always be a pointless exercise in the face of the reality that sexual reproduction is how the species continues, and that it's through the union of two gametes that are as unalike as 0 and 1.