Start this inverted delight by lying flat on the ground face up. With your hands supporting your lower back, lift your legs and backside way, way up so they're as perpendicular to the ground as you can get them. Have your man kneel before you, grab your ankles, and bring his knees to your shoulders. Then take his hands and ask him to hold your hips — that will steady you both. Hold his thighs for leverage and adjust so your genitals can join for some otherworldly upside-down action.