sexual dysfunction

23-year-old male who isn't sexually active . but doing masturbate regularly.  Up until a few days ago he was getting erections normally, and even after ejaculating, It would be hard again within minutes.  Today, however, he was looking at pornography on the Internet and no matter how much of it he saw, he couldn't get an erection.  he has been masturbating more frequently lately, with ejaculation with no erection , and I was wondering whether that might cause it.