I certainly agree it's a very difficult situation, but not unusual either in my own experience, or that of most women I know well enough to discuss these matters with.
In the OP's situation his DW was never bothered about sex, he knew it from the start but hoped it would change. It's likely she did too, given her lack of prior experience - but it hasn't. We can see from this thread that some people just don't need physical intimacy to reinforce their emotional bonds, and some people do. Most importantly, OP has not said he fears his wife doesn't love him, or is not committed to their relationship.
I do think this is a situation which is very unequal for men and women. When men develop erectile dysfunction, there is often a physical cause but that isn't always the case, especially for younger men. It can't always be treated, and Viagra is only effective in 30-40% of cases of severe ED - and of course side effects mean it isn't suitable in every case.
I'm not sure I would expect a man to "pretend" or "make an effort" if in those circumstances, he didn't want to. I mean, what would be the point? Similarly, why expect a woman to "pretend" or "make an effort"?
For many people, lack of physical intimacy is part of life, especially as they get older. The real issue is whether you are prepared to accept the situation without resentment, maintaining your love and respect for each other and what you have achieved together.
I would also suggest that if you have children together, there's more at stake than your own happiness and contentment.