Mechanical, Endocrine, Performance, and Psychometric Effects of Perineal-Compression Injaculation, Ejaculatory Abstinence, and Antegrade Ejaculation

A two-phase, randomized, sham-controlled trial pairing an acute within-subject crossover with an 8-week parallel-group intervention to characterize the 'injaculation' technique and to test, under expectancy control, the operationalized claim that ejaculatory redirection or retention produces measurable physiological benefit.