Does the taurine in the energy drink Monster contain bull semen?

The answer is No.
Red Bull and other energy drinks do not contain Bull Sperm. This idea came about since there is an ingredient called "Taurine" in it. This ingredient is NOT bull sperm but an aminoethanesulfonic acid, particularly in this case, an extremely high quality synthetic production of this acid.
Naturally occurring Taurine is necessary for normal skeletal muscle functioning, even assisting with those affected with congestive heart failure by increasing the force and effectiveness of heart-muscle contractions. It also acts as an antioxidant and inherently protects against toxicity of various substances (such as lead and cadmium). Additionally, supplementation with taurine has been shown to prevent oxidative stress induced by exercise.