Salaam Ikler,
Regarding your questions, I share brother Jospeh Islam sentiment when he made the following statement in one of his articles: The Quran does not intend to address every possible human scenario and prescribe a religious edict to it. It provides necessary guidance, where necessary, for one to take from it the best meaning (39:18), apply it to the best of one's abilities (64:16) and not to unduly complicate religion without warrant.
So with regards to watching movies I, personally, see nothing wrong with it provided that decency is practiced. And what I mean by decency is, as brother Hamzeh alluded, that one not avoid movies in which the characters are exposing themselves (nudity wise); or at the very least one should lower their gaze during moments (or scenes) of indecent acts.
On the issue of going to cinemas, I see nothing wrong with men and women freely mixing in any given event, provided, as alluded to above, that decency is practiced - i.e one does not transgress the limits laid out in the Quran regarding (but not limited to) unmarried persons.
This is my humble opinion. Always remember that It remains our duty as Muslims to seek the best meaning from what we hear by scrutinize and evaluate all arguments and following that 'which is best’ (see: Quran: 39:18). Every position / argument should be carefully pondered over and then proceed to only accepting / upholding whichever argument / position is true (or closest to the truth).