'Humping Lady'

Inverted Mousetrap Missionary (Guarantees Her Orgasm)

Perhaps the easiest of all positions for a woman to orgasm in.  
This is like the Missionary posture, except roles reversed!  The man lies on his back with legs apart, while the woman lies atop him, her legs together.  It is the flip of the 'Mousetrap' position, where her legs close together to 'trap' his man-rodent.  Pushing from her toes, she can grind and thrust and rock atop him, much like a man normally does during the Missionary.   She can thus set her own pace, angle, and thrust, to move towards her orgasm.   Watch her 'hump' like a man!  Pivoting on her clitoris.
Your woman not enjoying sex enough?   Try this for her big 'O'!

Variations:

Put a pillow under his hips, to change the angle.
Or, his legs out wider, so his and her legs form a 'Peace Sign'.