The front groins refer to the creases running from the hip points (the two little bony knobs a few inches to either side of the navel) diagonally down and into the pubic bone (the front bottom of the pelvis), which together form a «V» shape. (yogajournal.com)
Always tip into a forward bend from the groins, being sure to maintain the length of the front torso, especially the lower belly between the pubic bone (the front bottom of the pelvis) and the navel. (yogajournal.com)
After the baby gets closer to the bottom of the pelvis, pains in the groin, sacrum and the area of pelvis occur. (infobaby.org)