The position of the crab or jointer

 Description:
The woman straddles her partner back, lying on the bed. It guides the penis into the vagina and then switch back by leaning on his arms. It can then go back and forth vertically by moving his legs.

Goodies:
• The woman controls the depth and speed of penetration.
• Man is free to fondle the breasts of his partner.
• The feeling of the hair of the woman caressing the man's face is especially nice and exciting.

Cons:
• Risks of involuntary exit in case of too fast and uncontrolled movements.