I happen to think it's quite likely that there are good explanations for the phenomena you cite that don't include "women are intrinsically more biased against cryonics than men"

I think the explanation is that women are intrinsically more conformist then men and since cryonics is currently unusual and perceived as weird, well.

so it would be a bit daft to assume that that one possibility explains all the variance.

The rule of thumb is that 20% of the causes are responsible for 80% of the effect.