Missionary is a sex position in which a person lies on their back and the partners face each other. May involve a leg lock, a folded body, and/or the penetrating partner grabbing the penetrated’s legs.
Try not to confuse this with the reverse suspended congress utilizing the full nelson wrestling move, especially since a person's extremely folded body in the missionary position can be mistaken as a full nelson grab. The key difference is how the top's hands are drawn. Here, you want to see the hands positioned so that they have to be in front of the bottom.