The only thing that stops me joining is the fact that A) I find it pointless. My partner is a very high up mason, head of county and says the women’s is just for show. You don’t get told or get to do half the things then men’s lodges do.
As I explained upthread, there are different branches ("obediences") of Freemasonry including those that accept women in mixed lodges as well as women-only ones. Google the ones I mentioned upthread and contact one of them. See for yourself.
Your DP might tell you that those obediences are not 'real Masons' but he is wrong 
2) it’s SO sexist. I have a huge issue with this! My partner persistently tells them to let women join but they never do.
That sounds like Grand Lodge. He would be better suited to the Grand Orient.
When people are saying what do you do there, they read scripts that already have the words done for you, it’s like a play. They act out with props.
Yes, those are the rituals and ceremonies. That is not all we do, though.
The initial ceremony involves a noose around your neck so you can’t step backward and a dagger over your heart so you can’t rush forwards.
That is not the meaning of those "props" 
The “secrets” are metaphors so you can develop yourself as a person, nothing actually secret at all. Just phrases etc.
Yes.