Association between time-to-ejaculation and the quality of semen obtained by masturbation

Objective To investigate the association between the length of time-to-ejaculation and the quality of semen obtained by masturbation. Methods Ejaculates from 284 men under infertility assessment were analyzed according to World Health Organization guidelines. Seminal neutral [alpha]-glucosidase (NAG), zinc(Zn)and fructose(FRU) were also measured. All patients were divided into three groups according to the length of time-to-ejaculation, including group A with time-to-ejaculation not more than 10 min, group B with time-to-ejaculation of 11-15 min and group C with time-to-ejaculation more than 15 min. Statistical analysis was performed. Results Time-to-ejaculation was negatively correlated with sperm concentration (r= -0.20, P = 0.02), total sperm count (r = -0.20, P=0.04), NAG (r = -0.20, P = 0.01), total count of progressive motility (r = -0.40, P = 0.03) and fructose (r = -0.30, P = 0.02), respectively, but not correlated with age, sexual abstinence, semen volume, sperm motility and Zinc. Sperm concentration