Keep in mind who collected the data. From the Atlantic:
Most People Think Watching Porn Is Morally Wrong In debates about the industry, it's easy to forget that most people think erotica isn't for them. By Emma Green
"All men look at porn .… The handful of men who claim they don’t look at porn are liars or castrates." That's what Dan Savage, a Seattle-based sex columnist, wrote a few years ago in response to a reader who was fretting about her boyfriend's affinity for erotica. By this point, his argument seems like a trope: All red-blooded men have watched porn. It's just part of life. Get used to it.
Whether or not Savage is right about how often people watch porn, they don't seem to be "getting used to it." According to data from the Public Religion Research Institute, only 29 percent of Americans think watching porn is morally acceptable. Somewhat predictably, men and women have very different opinions on the issue: Only 23 percent of women approve, while 35 percent of men think it's okay.
These statistics suggest something wildly different from the Dan Savage view of the sex world. Even if it were true that all men watch porn at some point—which it probably isn't—65 percent of them feel bad about it.
One striking thing about these findings is the incredible variation in how people think about porn on a personal level and how they think about it on a legal level. Overall, 39 percent said they'd oppose legal restrictions on pornography, compared to the 29 percent who consider it morally acceptable. That means roughly ten percent of people disapprove of porn but don't think it should be illegal. The demographic breakdown reveals some unanticipated nuance. A twentysomething and her grandma are just as likely to think access to porn shouldn't be restricted on the Internet (42 percent), but the Millennial is five times as likely to think watching it is morally okay (45 percent versus 9 percent). Democrats and Tea Partiers have similar attitudes about legal restrictions against porn (41 and 40 percent opposed, respectively), and Tea Partiers are much more morally forgiving of erotica than those on the right who just call themselves Republicans: 27 percent versus 19 percent say it's okay. (Earlier this week, I noted a similar divide in the PRRI survey between Americans who support a right to gay marriage while still disapproving of gay sex.)