Steve
Mostly Harmless
So no. You have no evidence just opinion.
There are tons of blogs and support sites for women in grappling arts like Bjj and these issues are discussed.
I don't think that anyone has commissioned a study, and I suspect that if they did you would dismiss the study as biased.
I don't agree with everything hanzou says, but in my opinion, he's spot on with this. The ego takes a beating in Bjj and there's no hiding from your skill or lack of it. And I've seen tough guys panic from shoulder pressure and claustrophobia.
One of the real advantages of grappling over striking is the ability to spar at close to 100% without getting dangerous. But it can be hard to get past the space and pressure, and not everyone is able to do it.
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