There was actually a proper study done into whether increasingly hard pornography had an impact on mens treatment of women, and it came out with quite a damning 'yes it does'. I can't remember the name of the woman who led it, though. I'll try and find out.
Not all pornography is bad, though. Appreciating the beauty of the naked female form or two attractive people making love isn't bad. But watching girls be systematically abused and demeaned purely for sexual gratification is.
The control of sexuality thing is a big stumbling block for feminism. On one hand women should be in control of their sexuality, on the other it is easy to convince impressionable teenagers that sexual liberation means promiscuity and you end up with a situation where women are expected to have sex and are considered odd or prudish if they don't want too. This is sadly where we seem to be, in the Anglosphere at least. It needs to be about the womans choice and not being judged or pressured wither way, not what a male dominated society expects. It is a very, very complicated issue. It does feed into the birth control/abortion debate, though. The easiest way to try and impose a traditional morality on women is to deny them the ability to mitigate the consequences of exploring their sexuality. The consequences for men are no where as severe, to quote one of my favourite cartoons:
Parenting a teenage boy is easy, the worst they can do is ruin some teenage girls life. Parenting a teenage girl is impossible.
Sad but true.
It's half past six in the morning so I apologise if I'm a bit rambly or unclear.