There is only one studio for professional films, where you can start a pro movie.

There is also the writers hut for producing new pro movie scripts and you got the porn expo where you can add one pro and amateur movie weekly.

Furthermore there is rocket science building which is needed to unlock the currently best pro movie (level 60 and 150 Billion cash (or 2000 CC)).

And at last you can start amateur films at any HCL building (but additional bonus differs).

For addding sexual preferences see my reply to your other post.

For adding more girls you got to finish levels and classes (film academy -> level 70 or Big D -> level 40 ). If you want to go beyond this number you got to buy real money girls (comes with extra slot) or you got to pay 100 CC for a free extra slot.