So I have a anatomical position question. I have found I like when I brace one of my partner's legs against my upper arm as I am penetrating her. I know that my arm prevents her from closing her legs and it lifts her pelvis up a little. The problem is this position causes strain on her braced thigh which cant be maintained long.
So my questions are:
1) Anatomically, what is this movement doing?
2) More importantly, is there a way to replicate this position without the strain. We've tried some pillows for propping but haven't hit the sweet spot yet
Thanks in advance!