For the absolutely deepest penetration possible you can combine the widely open position with a press. He straightens his legs and holds both himself, and her legs up with with his arms. The trick here is for her to spread her legs open as much as possible. She can also slid a hand down to masturbate herself in this position. Absolutely our favorite sex position and we are sure once you try it it will become your favorite too!
In the Kama Sutra this position is known as the variant yawning position.
Def one of our favs, great penetration!
One of ours too!