From Advocate.com…
[…] The study recruited 265 men who have sex with men (MSM) who were asked to relate the number of hours in an average week they spent viewing “man on man” porn, and how much of it featured anal penetration with a condom, as well as condomless anal sex.
In order to discern the perceived impact of their porn consumption, participants were also asked to describe how often in the preceding three months they fantasized about engaging in sexual acts they had watched, if watching Internet porn influenced the kind of sex they desired, if they sought out sexual contact after watching [porn on] the Internet, whether or not they felt Internet porn contributed to their engaging in “risky sex,” and whether they engaged in condomless anal sex.
Nearly all of the participants had consumed at least some porn both with (91.3 percent) and without (92 percent) condoms in the preceding three months. And researchers were able to discern a clear correlation between condom usage and the condom content of the pornography consumed by the participants; for instance, those who consumed “much” condomless porn (50 – 74 percent) could be expected to participate in 25 percent more sex without condoms than those who only viewed “some.”