Ask HN: How to find a woman technical co-founder?

Maybe post on forums or reddit subs that are pertainate to women's wellness. That's the niche - not the technology side. So you should be able to find individuals on those pages who also have the technical skills. It's more like finding a needle in a haystack looking in the technology forums for any resources who are passionate about a non-technology specific niche.

Do you have some sources for this?

"There are a million reasons why women prefer to work with women."

And the same is true for men wanting to work with men.

"this is hardly going to deprive some man of an opportunity."

If one is actually excluding men, then this by definition deprives them of that specific opportunity.