These penis figure candles are a traditional ritual tool in folk magic and witchcraft for working with sexuality, seduction, and the current of mascululine energy. The red figure candles are usually worked in spells for love spells, passion, and desire. They can also be used to channel masculine empowerment.
Black penis candles are used in workings to curse a persons manhood, anointing it in Crossing Oil, and burning it alongside Black Arts Self-Igniting Incense Powder to make one impotent. Another working is to anoint a black penis candle in Crossing Oil, and dressing it in pepper. With several pins, pin the penis and then bury this in a graveyard. 
Each magically-crafted candle is hand-poured and rooted in traditional designs, and used to amplify intent and command results in your spellwork