"In many ways, they're doing much better than the men. (Just look at the lopsided university graduation rates, which are now around 60-40)".
Women in STEM/computers (useful degree) is a tiny fraction,yet women totally dominate the arts (useless degrees) while men dominate the trades which usually pay better.

"Today, most men can have all the sex they want for very little cost"
Nope,studies show that 10% of the single men get 90% of the sex.

"and the arrival of online dating sites, which make it easy for men to find willing sex partners."
I've looked on tinder,it was 95% men.None of my friends had any success on Tinder.

"The marriage rate is falling steadily, especially among the lower middle class, while long-term stable marriage is increasingly a privilege reserved for the better off."
This just proves the point that women want the guy with tons of dough.

"including online porn on demand that can make the real thing feel mildly disappointing."
What does this even mean?