Hay muchos subtítulos, pero donde encuentro las películas de las q descargo los subtítulos

You have choices :
1- Buy the dvds or subscribe to the website corresponding to the videos or movies that you want. (and support the porn industry)
2- Find them to download by searching their titles with your favorite search engine. (if you don't have money)
3- Find and watch them on streaming and use a browser plugin like "Substital" to load the subtitle. (if the quality is not very important to you, depend of the streaming service)
4- Have friends who are very kind to share their account or dvd or movies wich you are interested. (and buy a beer to your friends to thank them)

Have a nice day!