Sacrum Images
http://en.wikipedia.org/wiki/Sacrum

Chiropractic Perspective:

The AS Ilium Fixation, Nutation, and Respect
By Joseph D. Kurnik, DC

You can see along the bottom of the pubis and ischium bones where the adductors connect.  You can also see how rectus abdominis connects to the top of the pubic bone.

More simplistically drawn, but with better labels:

http://www.getbodysmart.com/ap/muscularsystem/thighmuscles/anteriormuscles/menu/menu.html 

Bones

Where Sartorius and Tensor Fascia Latae connect

Where Rectus Femoris (a quadricep) connects:

 You can see these hip flexors here.  You can also see, in the inside of the pelvis, the psoas and iliacus muscles, and where the adductors attach to the pubic bone.