Put sexual conditioning, especially with porn, in that article, and everything will make sense. Teens are horny, and if they can't have sex, they substitute sex with masturbation for so many years. This alone, in my opinion, can wire the brain to solo sex to some extent; but not so much, because masturbation without porn is not much exticing. With porn, wanking becomes so much more exciting, and the sexual conditioning is much more powerful. Most, though not all, heavy porn users are people with little success with girls. Therefore, late virginity can be linked to sexual problems. It makes sense to me.
Also, there is the psychological aspect. Failing with girls for a long time during the period of life in which libido is highest can lead to frustration, anger, and lack of self-confidence. All things that impact in a negative way on your sexual life.