Missionary

How to: Lie between her spread legs, so that you're lying on top of her and are face-to-face. While supporting your weight on your elbows or hands, insert your erect penis up into her, so it's parallel to her vaginal walls.

Switch it up: Wrap her legs around your waist to change the shape of her vagina, which will alter the sensation for both of you.

Perfect for: First-time sex