@Thulian
The thing is sex is by definition a description of a function, reproduction. Of course not everyone can functionally reproduce, for all kinds of reasons, but being male or female is about which role in reproduction your body is built for. It’s true that involves a variety of factors, eg organs, hormones, gametes etc but that doesn’t mean that they make up separate proportions of being that sex - they are just aspects of it. You could take them all away and you’d still be that sex.
This is possibly controversial but I think part of this thinking may be down to the fact that it is, according to some, sexist and homophobic to say that sex (the act, sexual dimorphism, sexual pleasure, the sexual organs,) exists to make babies.
The feel that it reduces "being a woman" to babymaking and that it implies that sex between homosexual couples is not complete or functional, or that homosexual sex isn't a thing that exists for itself but only as an offshoot of heterosexuality.
None of this thinking would be possible without reliable contraception, it would be clear to everyone why people are sexed. But we seem to have a whole group of people, particularly some of the younger people, who are ideologically committed to the idea that sex, the sexual act, exists in order to express love, or for fun, or to get off. Reproduction is a nice side-benefit for those who choose it.
Most, if you put it that way, would become flustered because it becomes clearly idiotic. But they don't think about it clearly so it's just a hot mess of ideas floating randomly.