This is like one of my students asking if the tendon in our wrists will shrink and be useless in the future because its needed for writing with a pen or pencil and since we type everything now on phones and computers, then that tendon in our wrist won't be needed and natural selection will select for wrists that don't have that tendon because we type now.
A man last name Lamarck postulated that change in a species happened because a parent did something to their body that then changed their offspring. Classic example: giraffe. Giraffe grazed on trees. They had short necks and could only eat the lower leaves. Some giraffe, however, stretched their necks to reach higher leaves. They did lengthen their necks as they tried their whole life to reach higher leaves. That giraffe's offspring, then, has a slightly longer neck than its peers due to its parent's struggles with leaves. As the time passed, giraffe continued to stretch for leaves until, viola, we have our long necked giraffes of today.
That's also like saying I can lift weights, get huge, then have a kid, and my kid will be muscular.
If anyone thinks that human penises have actually increased by almost 25% in just a few decades, you are an idiot who needs to go back to school. This is NOT how human evolution happens, nor any evolution. Short term changes in diet and habit, sure. But physical change like this, so that statistically speaking, all male humans are trending on having larger penises, this does not happen, physically, in decades. This kind of clinal change would take thousands of years.