Purpose: This study aimed to investigate the relationships between intravaginal ejaculatory latency time (IELT), severity of disease, and chronotype in lifelong premature ejaculation (PE). Materials and Methods: Evaluation was made of 114 males with PE and 103 healthy individuals, and comparisons were made of self-estimated IELT, Arabic Index of Premature Ejaculation (AIPE), Pittsburg Sleep Quality Index (PSQI), and Morningness-Eveningness Questionnaire (MEQ). Results: The frequency of morningness chronotype (78.1%) was significantly higher, and Morningness-Eveningness Questionnaire (MEQ) scores were negatively correlated with both IELT (r = −0.490, p < 0.001) and Arabic Index of Premature Ejaculation (AIPE) scores (r = −0.639, p < 0.001) in the PE group. MEQ scores significantly predicted IELT (t = −2.465, p = 0.015) and AIPE scores (t = −4.003, p = 0.000) in the PE group but not in the control group. Conclusion: It can be asserted that morningness chronotype is more common, and ejaculatory latency time and PE severity are associated with chronotype in males with PE.

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