No, definable not. acne is caused by a build up of oil and very small amounts of dirt in the pores. teenagers get them because the hormone which controls oil production in the skin gets overstimulated during the changes to the brain in puberty. it has nothing to do with masturbation except that kids often start becoming sexually aware when they hit puberty around the same time as they start having acne. they idea that there is a causal link is a puritanical, sex-negative myth.
He filled her twat with cum. All that I could do was jerk off over her and came repeatedly.