Effect of Prostatic Urethra and Seminal Vesicle Morphometry on Ejaculation

The goal of this observational study is to learn whether the size and shape of the prostatic urethra and seminal vesicles - measured on multiparametric prostate MRI (mpMRI) - are related to premature ejaculation (PE) severity in men aged 18-55. The main questions it aims to answer are: * Do men with premature ejaculation have different prostatic urethral length and angulation compared to men without PE? * Do men with premature ejaculation have different seminal vesicle dimensions compared to men without PE? * Do prostatic urethra and seminal vesicle measurements on mpMRI correlate with PE severity scores (PEDT) and ejaculation latency time (IELT)? Researchers will compare men with premature ejaculation to healthy men without ejaculatory complaints to see if specific anatomical features are associated with PE severity. Participants will: * Undergo a multiparametric prostate MRI that is already scheduled as part of their routine medical care * Complete validated questionnaires about ejaculation and sexual function (PEDT, PEP, IELT, IIEF-15) * Provide a blood sample for routine hormone level measurements