Could the obesity epidemic have a little to do with this? With around two thirds of the US population overweight, that's a lot of conventionally unattractive people. For males especially, being overweight drastically reduces the odds of being noticed by a potential partner. I suspect hormone imbalances, part of the metabolic syndrome umbrella shared with the symptom of obesity, might also have a hand in this.
tmptmp|9 years ago
But, I guess, there is another factor too. With easy access to too much and uninterrupted entertainment (TV, internet, whatsapp, snapchat etc) our brains may be getting too tired to bother about sex or our brains may be getting too satisfied to desire sex.