When in an upright position, with the woman on top, his feet are free - kneeling position. Kneeling can be uncomfortable if his back starts hurting. Its advantage is that the woman can get herself high and deep by raising her hips as she wants to. By lifting her hips, she gets more like a doggy style position, and lifting her legs also gets her legs higher, which not only makes the woman more likely to climax, but helps her lover to penetrate her deeper. However, kneeling requires good flexibility and pulling up the legs can be uncomfortable.
When kneeling behind partner, raise the rear legs upwards. It can help relax the woman's pelvic region and make the penetration tighter. In some cases it can help to stimulate the clitoris with the legs raised as well. Having raised knees can also make the penetration rhythm more regular and easier to control.
When the woman iss standing behind the man, if she manages to reach round behind her, holding his hips while she thrusts up and down, she can gain incredible leverage over her lover's penis and can thrust as powerfully as if she were crouching over him (or him over her). It is not an easy position for the woman to control and demands some flexibility in pelvic muscles as well as strong thigh muscles to keep her legs raised as high as she needs them to be. This requires a certain amount of practice, but it is very versatile - it allows either partner to enjoy an active role in positions such as cowgirl and many others.
When the woman is lying on her back with the man on top, the woman can raise her legs and put them in a resting position on either side of the man. The advantage of this position is that it requires less strength to remain in an active position in the man's back, than it does when the man is on top. d2c66b5586