These are horrible selections. They are made for 2 people that weight 90lbs each. Here something a little more universal. Should work for everyone up to maybe about 300lbs. My wife weighs 200 and I might weigh about 170ish.
1. She lays on her back, on the bed, with her hips just before the edge of the bed. (Preheated is good but this is still a good position if not)
2. You stand in the obvious location and get started.
3. Grab her by the ankles and support the weight of her legs with your arms. Hold them no more than 10 inches away from your chest while holding them at least a foot from each shoulder. Or if you have really broad shoulders, 6inches.
Just about any position that is similar to missionary that she is on her back will be about getting her to relax her legs so she can focus on other things while finding where you place them. Another example is supporting them behind her knees. The way legs are inherit to stay as parallel to the body during almost any typical activity. So the gravity will always pull them to that position. Supporting their weight so they don't have to and finding a relaxing yet mildly asexual aggressive position give mentality and the angle needed.
Its all math and science but every one of them has ruled a long time ago girth matters but length has some play in it also and some impact.
Each of them has their own rules. They'll tell you, unfortunately its usually not so direct. The one time you want to hear them and they become to embarrassed to say anything.
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