Hi OP. I understand that you specifically want to look at the experiences of women in your field, specifically cis women.
I also get where your colleagues are coming from. They are challenging you to look at the broader issues and also probably trying to save you from some pushback further down the approvals track.
Some of the possible issues that come to the top of my head are:
- I'm thinking that you could certainly put a call out for cis women subjects only. But then it's not outside the realms of possibility that you might then come up against claims that you have discriminated against non-binary people and trans women.
- You may even find this happens when the project goes to the further ethics committee approval stage, which occurs at all tertiary institutions. Hence your colleagues broaching it with you in the initial discussions.
- Also, even if your proposal got approved as a 'cis women only' project, what are you going to do when someone, say, a trans woman, participates in your project having not declared that they are trans? As they are under no obligation to do so, I could see this could present some challenges for your research in a number of ways.
My opinion, for what it's worth, is that it's therefore probably far more straightforward and reasonable, as some PP have already said, to open the subjects to cis and trans women, and non-binary people from the outset. That way you should also get around the issue of the possible non-declaration of identity.
In your introduction, subjects and methodology, you would obviously define and delineate all subjects, variables etc.
As some PP have also said, the sample size of trans women and non-binary people may be quite small. That is fine and not really an issue for you. You would simply note this for an area of further study in your discussion section.
As for the possibility of confounding factors that other PP have mentioned, such as what ages trans women have transitioned, that is a good point, and an obvious complicating factor. But again you could simply note it as an area for possible future study (and quite a fascinating one for someone to take up, I would say).
Overall, I don't really think this is a major issue unless you want it to be. I get that you wish to focus only on the experiences of cis women in this project. And I still think you will be largely able to do exactly that with some of the provisos I've mentioned. There'll be other issues I haven't thought of, which will no doubt come to light during further levels in the approval process. This is the nature of doing research at the tertiary level.
Try not to get sidetracked by the idea that some PP are espousing that it somehow 'isn't fair' that groups other than cis women may be included. We live in 2025. We are inclusive whether some people like it or not. Solve the research issue at hand.
(Also: a number of ridiculous and clearly false analogies abound in this thread. Ignore all silly comments about race and mice etc. That is all quite foolish and certainly doesn't assist you to solve your research issue. It's just people creating unnecessary drama.)
Best wishes with the project.