Scott Adams says that the “Moist Robot Hypothesis” explains why dick pics are a thing:
The Moist Robot Hypothesis also assumes that most, if not all, of our “decisions” are little more than rationalizations for our instinct to procreate in the most productive way. And by that I mean mating with people who have genetic advantages that would make the offspring successful. That’s why people are attracted to beauty, because it is a visual proxy for good health and good genes. For the same reason, women are naturally attracted to successful men that have talent, money, or some other sort of advantage. (Obviously these are generalizations and don’t apply to all.)
Our sex drive is so strong that it largely eliminates the option for rational behavior. And as you know, the hornier you get, the stupider you are. Once a guy reaches a critical level of horniness, his rational brain shuts off and he becomes primal. And when he’s primal, he sometimes signals his availability for mating in the most basic way possible: He displays his junk in full preparedness.
If you think the men doing this behavior are extra-dumb, or extra-rude, that might be true. But it is just as likely that such men are extra-horny. That gets you to the same decision no matter your IQ because the rational brain is shut down during maximum arousal.
It is also true – as far as I can tell from discussions with women over the years – that sometimes a dick pic actually results in dating and sex. I realize how hard that is to believe. But sometimes (maybe one time in 500) it actually works. You would think those odds would be enough to discourage even a man with a temporarily suspended intellect, but that view ignores the basic nature of men: We’re risk takers when it comes to reproduction.