Yeah, the sexism is terrible. It’s the one thing I can think of that you can remove from the game to make it even better.
Luckily, the player doesn’t have to engage in any of this, reducing it to unpleasant background noise.
I wonder if 3D Realms thought they had to add all of this to sell the game? Though back then it was probably just used as a tool to make the Duke look even manlier. People just didn’t think a lot about such issues. That’s not trying to justify, just to explain what I think is the reason.