I am very interested in this topic - not in porn, per se, though I would be if there were more female-friendly renditions around. I'm not about to repeat the very cogent arguments put here by better-informed feminists than me.
Just wanted to throw a few extras into the mix
The statement that women's desire is not visually stimulated is a lie. The fact is, we show a physical response (vaginal lubrication, engorgement, etc) to a far broader range of visual stimuli than men. In short, we can be turned on by almost anything!
Could male objectification and 'control' of women's sexuality be rooted in fear and/or envy?
However, women's perception of whether they're turned on seems quite out of kilter with what our bodies are doing. We can be sticky as a caramel factory 'down there', but still say we feel nothing.
Could this be an indication that we've been socialised to ignore own own bodies and responses?
Films like "Nine and a Half Weeks" and "Eyes Wide Shut", which were designed to appeal sexually to women (amongst other motives), are often excluded from discussions about sex in cinema.
Why is this? Which general-release film are you happy to say you did find sexually arousing?