Hi Babaly,
Why, I spent months telling people that I couldn't feel the pulse between the anus and vagina, but more inside the uterus... and no one understood. (I don't know where the cervix is exactly... have to refer to a pic of the anatomy of the female human) I no longer push my heel all the way back to find the spot between the anus and vagina... feel the pulse earlier. Thanks for bringing this up.
You're right. I often felt irritation when I read everything described only from the male point of view.
As for the difference, Siddhasana used to be an issue. Some say the right heel goes down for females and the left for males. Why, no one explains. I prefer, therefore the AYP view that either heel for either gender is OK.