What is Semen made of?
Semen, or cum, consists of 90% seminal fluids which includes fructose (sugar) and proteins, 1% of sperm and 9% of trace minerals and nutrients.  It contains about 12 to 15 calories per ejaculation (the same amount found in gelatin or egg white), which will not make a person fat if taken.
 
How does it taste?
Generally, men enjoy blow jobs.  For additional sexual satisfaction, men would be expecting their partner to swallow the cum when ejaculating in their mouth.  However, it is the taste of the cum which either put off some women from giving blow jobs or swallowing it down.  Salty, bitter or even acrid is what some has tasted.
 
What affects the taste and smell?
So what determine the taste and smell of semen?  It is actually what we eat and drink because semen is excreted by our body.  For semen to taste better, you will have to change your way to a better diet.
 
How to make it taste better?
A clean and healthier lifestyle is how you should start off with.  Stay away from drugs, alcohol, nicotine and junk foods.  Instead take more fruits and vegetables and drink lots of water.
Fruit juices that are high in sugar level such as pineapple, citrus, cranberry, mango, apple and etc can make your cum taste sweeter.  Vegetables wise, parsley and celery are highly recommended.  
Foods that you need to stay away from includes: fish and red meat which produce bitter and fishy taste, garlic and onions that produce strong odors, and chemically-processed alcohol that make it taste bitter.

A better-tasting semen is good; but having extra loads of better-tasting semen is better.  The volume of load is affected by age, heredity and health.  Since it’s impossible to change the first two, we could only make fine adjustment to a more healthy diet.  Zinc oxide, Horny Goat Weed, L-Arginine and L-Lysine are supplements which can help you increase in the load quantity.

By simply increasing your fluid intake, you can increase the amount of your ejaculation. When your body is well hydrated, your body systems are able to work more efficiently and have less trouble getting water from the bloodstream.

For your semen to taste better, make yourself fit and healthy.  Regular exercises and the increase in fluid level intake will help improve and increase the amount of your ejaculation, respectively.  Another tip is to avoid tight bottom clothing such as jeans as it will lower the sperm count.