The goal of this observational study is to investigate the impact of underpants fit among Thai males attending the Infertility Clinic, whether alone or with their spouses. The main questions it aims to answer are: * Assessing the effect of underpants fit on basic semen parameters and sperm DNA integrity. * Determining the prevalence of preferred type of underpants worn by Thai males. The participants will need to provide informed consent, complete a questionnaire consisting of 28 questions, and provide a semen sample.
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AI-rewrites the medical criteria so a patient or caregiver can understand them. Always confirm with the trial site.
Semen Volume
Timeframe: Semen sample will be collected once, on a date advised by the doctor, following a period of ejaculatory abstinence ranging from 2 to 7 days. The sample will be evaluated within 30 minutes of collection.
Total sperm count
Timeframe: Semen sample will be collected once, on a date advised by the doctor, following a period of ejaculatory abstinence ranging from 2 to 7 days. The sample will be evaluated within 30 minutes of collection.
Sperm concentration
Timeframe: Semen sample will be collected once, on a date advised by the doctor, following a period of ejaculatory abstinence ranging from 2 to 7 days. The sample will be evaluated within 30 minutes of collection.
Sperm motility
Timeframe: Semen sample will be collected once, on a date advised by the doctor, following a period of ejaculatory abstinence ranging from 2 to 7 days. The sample will be evaluated within 30 minutes of collection.
Sperm morphology
Timeframe: Semen sample will be collected once, on a date advised by the doctor, following a period of ejaculatory abstinence ranging from 2 to 7 days. The sample will be evaluated within 30 minutes of collection.