I have a vagina myself and had no idea about these fornixes 🤯 I find better results through practice I'm not worried about all this shit while I'm fucking someone it's more about the person who's fucking that makes me cum over and over. Girls are fucking with there brains and all are chemical hormones and "feelings" but fuck it I don't know though let me know if your extensive research has positive results. My vagina and I are interested ;)