Chronotype (or circadian preference) has previously been shown to be associated with sexual attitudes and behaviors and is an important factor affecting sexual satisfaction. The fact that some neurobiological variables, which are thought to have a role in ejaculation physiology, are also effective in the processes of sleep and the regulation of circadian rhythm, and evidence supporting the relationship between circadian preferences and sexual desire and sexual behavior; suggests that ejaculation disorders may be related to circadian preference. The aim of the present study was to investigate the relationship between intravaginal ejaculatory latency time (IELT), severity of disease and chronotype in lifelong PE.

After being informed about the study, all patients who gave written informed consent were questioned and diagnosed as lifelong PE according to the definition of International Society of sexual medicine (ISSM) by an experienced urologist. Since erctile dysfunction (ED) may accompany PE, the presence of ED symptoms was evaluated by the International Index of Erectile Function (IIEF-5), and those with IIEF-5 score <22 were excluded from the study. Age- and sex-matched control cases without lifelong PE were selected randomly among cases attending the hospital for a checkup procedure. A total of 114 patients with PE and 103 control subjects with similar sociodemographic characteristics were included in the study. A detailed medical and sexual history was taken, which included self-estimated intravaginal ejaculatory latency time (IELT), by an experienced sexual therapist. Moreover, Arabic Index of Premature Ejaculation (AIPE), Pittsburgh Sleep Quality Index (PSQI) and Morningness-Eveningness Questionnaire (MEQ) were administered to all participants.

Inclusion Criteria:

• male between the ages of 18-50 years,
• being sexually active, and in a stable relationship with a single partner for the last 6 months
• meeting diagnostic criteria of Premature ejaculation according to ISSM.

Exclusion Criteria:

• having a history of neurological and/or psychiatric disorders, any malignancies, sexual dysfunction other than PE, chronic systemic disease, or if they were taking alpha-blockers, phosphodiesterase type-5 inhibitors, 5-alpha reductase inhibitors, anticholinergics, antipsychotics, or antidepressants.
• presence of obesity (body mass index (BMI)> 30)
• presence of Erectile Dysfunction (IIEF-5 score <22)

Self representation of male gender, sexually active, and in a stable relationship with a single partner for the last 6 months.

Males who presented at the outpatient clinic of Urology with the self-reported complaint of lifelong premature ejaculation