I don’t see how this could be at all effective. There are many different DSDs, with different causes and impacts, and most importantly: some will affect males and others will affect females. Even with the same conditions, not all will be affected in the same ways to the same extent. Some males don’t respond to androgens at all and will have externally female genitals – others will have ambiguous, or male-but-undervirilized genitals. You can’t possibly just chuck every athelete with a DSD into the same category, as if they’re all the same. It’s not some sort of third sex, it’s males or females with medical conditions.
Even ignoring that, or if it was split into different categories of disorder, would there be enough athletes to compete? People with DSDs who not only want to compete but are good enough?
What people in this thread seem to be mostly talking about is 5ARD, what Caster Semenya has. My feelings on that are that that disorder does not cause insensitivity to all androgens at all, males with it respond to testosterone at puberty and have those benefits in sports. Semenya has testosterone in the normal male range - which their body responds to to afford them the benefits in sporting seen in healthy males – because they are a bonafide XY chromosomed male. Their high testosterone isn’t a variation of female, it’s because they are male. Semenya should not be allowed to compete with women. Neither should anyone else with the same disorder.
That disorder I think is somewhat of an outlier - most DSDs in males cause them to be a lot weaker due to not responding to androgens as a normal male. Still, that doesn’t mean they should compete with females because they are not females – just that it’s less likely to be an issue.
I can imagine how hard it must be grow up as female and then experience masculinisation at puberty, as with 5ARD. I’m sure its difficult to have any sort of DSD. I hope people struggling with it can get help and come to terms with it, and I completely see why they’d have a complex relationship to their sexual and gender identities. But they shouldn’t be allowed to compete in a sex category that they aren’t.
Sometimes we can’t do things we might like to do because of physical limiations outside or our control. Like being too short/tall, or having asthma, or poor eyesight. Just because that limitation is to do with your sex and gender identity doesn’t mean it should be waved away.