There are several things i can think of that would make you think there is.
First, men are going to say they have ED so they can get Viagra type prescriptions.
With the higher divorce rate, vs previous generations, men no longer have the attitude if they can't perform, she will accept me for who he is. On the flip side, women no longer have to accept a man's short comings, she will dump the guy and find someone who can get the job done.
There is also more competition for women today, or maybe it is more accurate to way, women have more options than ever before. America used to just be white guys to chose from, but now, there are all sorts of guys to choose from. Some of which have reputations for being excellent lovers. That isn't the reputation white guys have.
All of these things lower American's confidence. So what was good enough 20 Yeara ago, no longer cuts it in this more competitive world.