While the Roast Beef sex position may look simple at first glance, the difficulty is in the details. In particular, finding the angle needed to achieve penetration will be the sticking point for many couples -- and once that angle is achieved, the balance and strength required to maintain the position makes this a more athletic sex position than it may seem.
Because of this, the Roast Beef sex position will not be a viable choice for many couples. In order to achieve penetration, the receiving partner will need to be able to maintain a deep pelvic tilt. At the same time, the penetrating partner's quads and balance need to be strong enough to maintain their position while thrusting. If the penetrating partner's quads start to tire, more of the penetrating partner's weight will rest on top of the receiving partner -- which will make the receiving partner's position even more difficult.
Small changes in your body positions may help make this position easier to achieve. The receiving partner should press their knees firmly into the surface below them to provide leverage to raise the hips. On the flip side, the penetrating partner may wish to lean forward onto the receiver's shoulders to help maintain balance. Once penetration is achieved, the penetrating partner may find it easier to balance through grinding instead of full, long strokes.
Don't forget about the power of sex furniture to help too! A Liberator Wedge can easily slide underneath the receiver's hips to support the lower body and help maintain the deep pelvic tilt. Simultaneously, the Liberator shape's soft, plush surface can help cushion the hip bones from the stress of added weight on top of the body -- especially if you find yourself on the floor in this position.