Side effects of watching porn movies. Doctors has warned those who watch porn movies should be ready for bad results. Genetic Medical Expert Angela Gregory said that those under the age of 20, are facing a rapid ratio with erectile dysfunction. Angela Gregory reported that there are no fixed figures, but watching bad movies on smart phones and laptop is the main reason of the problem. She added that in the last five years she has seen a sudden increase of those patients facing with erectile dysfunction in her 16 years medical practice.