Post-pubertal heterosexual males are innately programmed to reflexively respond with pleasurable excitement when they look at a lovely, live, nude, fertile, female, the same delight their ancient forefathers experienced that served as the primary foundation for facilitating reproductive success and thus the survival of the human race; a cause for celebration, pride, and the renunciation of guilt by males for their automatic enchantment by gorgeous females. I propose and describe a new, unique, and independent field of scientific sexology that involves the study of the origin, structure, functions and consequences of pleasurable affective responses experienced during typical sexual activities that take place in the bedroom with an eroticized partner, such as the sensuous delights experienced during sexual intercourse and fellatio, (an area of study that has been totally ignored and rejected by \"sex\" researchers). I maintain that scientific sexology, WHICH DOES NOT EXIST TODAY, is defined by: A. The study and evaluation of unique sexual subject matter, B. The proposal that pleasurable sexual excitement is the primary motivational source of sexual orientation, C. The existence of four sexual orientation groups, female heterosexuals, male heterosexuals, female homosexuals, and male homosexuals, each having independent, distinctive, and distinguishable origins, developments, expressions, and consequences, and D. The use of introspection and unique methodologies, procedures, and research designs to support or refute hypotheses derived from four different theories of sexual orientation. Male sexual experiences during puberty and adolescence are considered to be critical periods for the development of sexual personality variables such as sexual identity, sexual variety, and infidelity, and for the development of non-sexual personality variables such as aestheticism, prejudice, and curiosity. Scientific sexology includes precise neurochemical measurement of male pleasurable emotion activation (e.g., left pre-frontal lobe activation) while viewing a nude female, and the use of sophisticated research designs such as construct validity to support or refute hypotheses derived from evolutionary theory and genetics. With this book I introduce the new, unique, and independent field that I call Hedonic Sexology, the scientific study of the joyous, ecstatic delights of real-life bedroom sexual adventures.