This black candle is sculpted so as to resemble the male genitals, creating a powerful aid in invoking the God and empowering spells of the male aspects of fertility.
Sympathetic magic is based on the principle of like attracts like, so you would use a candle in a shape that closely represents your need. For example, fertility spells have long been associated with penis candles.
They can also be used to (hmmm) control your mans male member!
You may wish to use Controlling Oil on the candle if this is the case.