The view that the physical body is evil and detrimental to a holy life and that only through renunciation of the world can one reach a higher spiritual state.
Pat Means, The Mystical Means, Campus Crusade for Christ, 1976. p. 200
asceticism - (from Greek askeo: ''to exercise,'' or ''to train''), the practice of the denial of physical or psychological desires in order to attain a spiritual ideal or goal. Hardly any religion has been without at least traces or some features of asceticism.
Asceticism, Encyclopedia Britannica
The Corinthian ascetics think that spirituality is antithetical to the enjoyment of sex within marriage. Paul wants his readers (which includes us) to understand that spirituality encompasses every aspect of one’s life, including sex.
Why a Moral Life Won't Get Us to Heaven by Jimmy Williams