Sex positions from behind are some of the best sex positions for g-spot stimulation. These positions allow the man full control over the depth and the motion of his penetration. The doggy style position makes it fairly easy for a woman to masturbate and also incorporate some sex toy such as a vibrator for extra clitoral stimulation. This position doesn't offer as much intimacy as other positions yet it's among the best sex position for manual stimulation and g-spot stimulation.