Doctor am 24 year old male. The problem facing is my quik ejection of sperm. But while masturbating I can control by stop and stat (read some where this called kaigal exercise. Some day before my girlfriend touches my penis and I got ejection suddenly. I got ashamed infront of her. And also am getting sudden erection while about thinking of sex. Penis errected size is 15 cm. Average masturbation a week is 10. I want to increase the timeperiod. Please give an answer.