Comparing movies to the Internet is like comparing a Bais Zona to an apartment complex.
In each side of the two cases, one could find pritzus. But in each, as well, there is far more in one side than the other.
In other words, while the Internet contains both good and bad, as does any place where large numbers of humans exist like an apartment complex, any modern movie as well as a bais zona will definitely have unkosher material in it.
I think the mod made an excellent point about being desensitized to this stuff; just because society conducts itself in a very liberal manner does not ch”V change halacha.
Also, if one reads only the reviews of the movies currently out there (without even watching anything), there is no way any halachic Jew could justify such a debased and pathetic excuse for “the arts”. I don’t want to quote titles, but it is already beyond absurd; I don’t need to see the movies themselves to know it is not for any good Jewish boy or girl (yes, girls, too) to watch.
Even in a “normal” (by society’s standards) movie, there are too many potential issues to mention in even a few sentences, and the actresses’ inappropriate attire is not even the tip of the iceberg.
As with any halachic question, if in doubt, ask your LOR.