TIPS

"This is a nearly 'all genital' position."

"Guys - Be careful, because if she comes, she will probably lose strength in the supporting leg and need support quickly.  

"Be prepared and know ahead of time how you are going to support her or move out of the position if her legs go out.  

"My suggestion - hold her waist, slip out from under her and move in front to support her until she recovers. Then move to an easy position for her to relax for a while."

Standing Wall Sideways

Accessories:  Wall or Immovable Object

If the man has hips at a similar height as the woman and the woman is an active ballerina or fitness instructor, this sex position may be one you want to try.

All others, stay away.  You can have a wonderful sex life with or without this position!

She stands sideways to a wall or immovable object. He lifts her near leg and enters.

She can leave her foot behind him as illustrated (hard), or move it around in front of him and around his hip as in the Table Standing Sideways lovemaking position to make it a little easier.  Both are still "difficult" positions.

FOR HIM:  The good thing is that you have access to her breasts and clitoris, which she will like. With her legs spread like this, her clitoris should be sticking out from under its hood and begging for some attention. Give it what it needs (gently).
 
If her leg is in front or you, it will be easier to hold her hips and help stabilize her.

FOR HER:  Keep your balance by holding onto the wall or piece of (heavy) furniture.

If you are flexible and comfortable in the position, it is hard to get more open than this. He has access and sight of your most intimate parts and he should be taking advantage of them!