Premature ejaculation (PE) is one of the most common sexual dysfunctions. The definition, classification, as well as diagnosis of PE have been well investigated over the past (Althof et al., 2010; Laumann, Paik, & Rosen, 1999). The International Society for Sexual Medicine (ISSM) made the definition of PE, including lifelong PE and acquired PE (LPE and APE) as a male sexual dysfunction characterised by ejaculation that always or nearly always occurs prior to or within about one minute of vaginal penetration (lifelong PE) or a clinically significant and bothersome reduction in latency time, often to about three minutes or less (acquired PE), the inability to delay ejaculation on all or nearly all vaginal penetrations with negative personal consequences (Serefoglu et al., 2014). PE was associated with not only the negative emotions of both patients and patients' partners but also related to some characteristics, such as anogenital distance (AGD) and age (Serefoglu et al., 2014). Furthermore, several diseases, such as lower urinary tract symptoms (LUTS), erectile dysfunction (ED), acute/chronic prostatitis and hypogonadism, can be considered as risk factors or the aetiology of PE (Gonen, Kalkan, Cenker, & Ozkardes, 2005; Lee, 2014). However, more valuable factors related to PE are remained to be investigated and clarified. The metabolic syndrome (MetS) is composed of a cluster of metabolic risk factors including elevated waist circumference/central