I'm trying to compile a list of all the basic physical input which realeases happiness chemicals. some of these sound painful in excess and in moderation the happiness felt is 0 but im assuming during deprivation expanding of the osophogus blood to heart muscles joints brain. skin approach 33 degrees celcius. oxygen to lungs. scratching an itch. vibration of voicebox. intestines expanded. atmospheric pressure on skin and muscles. average moisture on skin. fat lipids to tounge sugar to tounge salt to tounge temporary brain shutdown. touching penishead/clitoris.