well, I am sure a database has information if you are more specific.
1) What is being affected in someone's sex life?
2) You don't clarify how porn is necessarily going to affect it.
3) For instance, does porn make users have less sex? Does porn make users have more sex?
Ect, etc, There are hundreds, thousands, maybe millions of possible affects porn can have on someone. You have to clarify which one you are writing about!