The real problem with male masculinity to me is being in an estrogen induced environment. Japan plays less games these days than they did in the past and yet they are STILL having an issue with mating, marriage and childbirth. Third world countries are not having this problem. Hmmmm....I wonder why?
But If you'd check the numbers, you'd probably realize that the amount of time the average japanese male plays video games and watches porn is also STILL way ahead of most third world countries...
Personally, while I too suspect hormones (esp. estrogen) to have a significant negative effect on men, I also believe that excessive video games and porn consumption probably have a significant negative effect on men as well.