Posture and pace are crucial to safely and pleasantly reaching the cervix—sharp, rapid movements significantly increase the likelihood of pain.
Spoon Position (on the side) Moderate depth, full control over the pace for both of you — a good starting point for experimenting with deep stimulation.
Lying on your back, knees to your chest The angle of your pelvis changes so that penetration goes straight to the cervix—just use gradual, slow movements.
The woman is in control Poses where the woman can control the depth and pace herself (sitting on top) are the safest for this type of experiment — she can immediately slow down or stop if she feels uncomfortable.
The need for communication Since cervical sensitivity changes from day to day (in relation to the cycle), constant, open feedback with your partner is especially important here.