A:A great position for inexperience is the "arch". The man sits in front of the woman with his legs folded under him (sitting on his knees). The woman lays on her back with her legs over the mans thighs or resting on his shouldes. Put a
pillow under her back for comfort, deeper penetration, and better allowance to hit her G-spot. This position allows for more freedom of movement for the man. In your free time, do some sit-ups to work the lower abdominal muscles, and maybe in time you'll be able to tighten and loosen your vaginal muscles around him.