Last time i ejaculated i noticed a riced size clump of semen at the tip of my penis. it felt real thick. i masturbate a lot, is that the cause? thanks

Stop worry!: The texture and feature of semen widely vary among men and even from time to time along individual life reflecting personal makeup, frequency of ejaculation, etc. Fortunately, such variations bear no known clinical significance as long as functioning well to serve your need for procreation. Hence, it is not directly related with masturbation.