Chemists developed a system to classify elements biologists developed a taxonomy for animals and plants. However psychologists have yet to develop a scientific system of pleasures and displeasures. At the most abstract level, one can distinguish pleasant and unpleasant experiences. You might not even feel pleasure.
Every experience is unique.
However, experiences of pleasure and displeasure can share certain aspects that we can use to classify them. Some classifications are more meaningful than others. One important aspect seems to be the cause of pleasures and displeasures. This dimension is important because an understanding of the causes of pleasure and displeasure can help people to obtain more pleasure and less displeasure. Some pleasures are elicited by stimulation of our sense organs such as mouth, nose, ears, eyes, and skin.