Ginger Granny Makes Monster Cock Rock-Hard by Venus Luxury is an instructional oil that you can use to make your man rock hard. Venus Luxury has been creating quality products for over a decade, and they are well-known for their rock-hard, vibrating sensations. With these new recipes, they have made the sensation even stronger with a combination of grapefruit oil, cayenne pepper, and ginger. If you want to be totally blown away by your lover's reactions, try using this oil on your fingers, shaft, g-spot, or clitoris..