3 dogs in a trenchcoat

someone with a developmental disability in which they mentally remain very much a child for their whole life

Adults with down syndrome are not “mentally children”. Some people with down syndrome are able to live and function independently, and even among those who don’t, they are disabled adults with higher support needs, not children. Being disabled doesn’t stop time from passing, disabled people still fucking age.

and you know what else? People with down syndrome are perfectly capable of having consensual sex. Because they’re grown fucking adults who can think for themselves. To declare them children does them a disservice and robs them of their autonomy

Yes it’s awesome and sexy. Don’t be a weenie.

Sex is a lot more complicated than male/female. There’s a bunch of different sex characteristics that make up “sex” and people can have all sorts of different combinations of them. If you just use a male/female binary, that doesn’t tell people what sex characteristic you’re referring to. Maybe something affects people based on chromosones, in which case people who are xy but otherwise “female” (like with cais) would go in the “male” category and vice versa. Or maybe something affects people based on hormones, in which case transgender people taking hrt would have to be categorized based on that. If you say “male/female”, no one knows if you’re talking about hormones, or genitals, or chromosones, or gonads, or whatever else, so it’s best to be specific and use language like “people with [body part]”

People with vaginas is the right terminology if discussing something that pertains to vaginas. Eg. “People with vaginas should make sure to see a gynecologist regularly.” in this case, saying “women” would exclude/misgender many trans and intersex people who have vaginas but are not women, while also including some women who do not have vaginas and would not need to see a gynecologist