Disagree.
First of all not all modern men are monogamous. Far from it, even the married ones.
Second, Porn does not equal sex. You say men are deep programemd to have multiple sex partners. Many men who watch porn have ZERO sex partners, unless you include themselves.
Porn does nothing to alleviate the supposed suppression of having multiple sex partners, it can actually make the suppression much worse and more unpleasant and distracting.
Some modern men, live a life of abstinence, meditation, fitness, focus on priorities and become much capable of living in the degenerate modern world.
However, this does tell us a lot about the men you know...