There have always been three but intersex (previously called hermaphroditism) was not taught which must have made it difficult for those that had to deal with it. It has always been recognised medically as a sex but unfortunately even now people confuse it with transgenderism.
Beyond that I think that you only need to research it so far as it is of interest to you. If you meet anyone who says that they are something that you haven't come across, then either nod politely or look it up if you want to know.
I am not really interested in people's sex lives. I would stand up for someone who was being abused or insulted as a result of whatever they are but so far as the protests are concerned, it is really about whether people with extreme religious beliefs should be able to put those beliefs above the rights of others. People do often talk about how lonely and confused they felt as teenagers and how much earlier education would have helped them. The protesters are people who think that homosexuality is a choice and that people should choose against it.
Girls grammars in the 60s (and beyond)
Favourite small treat when feeling blue or conversely a bit flush
