No correlation has been found between exposure to porn and negative attitudes towards women.
As other commenters have stated, it is really difficult to conduct a good experiment given the difficulty controlling for other variables. However, I'm not even sure it is the right question. I'd be more interested in men's attitudes towards themselves given habitual exposure to porn.
The same experimental difficulty exists, but I think it is more "upstream" from negative attitudes towards women. That is, in the course of the hypothesized man turned sexual predator, there is probably a period of sexual frustration that may be exacerbated by the non-reality of porn. This then develops into the deviant.
As other commenters have stated, it is really difficult to conduct a good experiment given the difficulty controlling for other variables. However, I'm not even sure it is the right question. I'd be more interested in men's attitudes towards themselves given habitual exposure to porn.
The same experimental difficulty exists, but I think it is more "upstream" from negative attitudes towards women. That is, in the course of the hypothesized man turned sexual predator, there is probably a period of sexual frustration that may be exacerbated by the non-reality of porn. This then develops into the deviant.