Well, if there is any correlation, I'd attribute it to adrenal secretions. also, cis-females produce progesterone in their adrenal glands as well as in the ovaries, so perhaps it's a minor reaction akin to that. honestly if people would just bother to research our little societal niche I think we would have all the answers without all this trial and error.
Remember though, I could be totally off. I'm just making a total ballpark hypothesis.