Yeah, most of us complain that there's too much of it in the movies. A screenplay, at its basic level, is a form of dramatic writing.
Successful screenwriters employ the same tools of craft as successful playwrights.
Of course, there are differences in presentation. A stage play is confined to a proscenium . But in both forms of storytelling, characterization and conflict are the mechanims used to move the plot forward. Many great works of drama employ some form of sex and violence. Just because the talented playwrights of the past have relied so heavily upon sex and violence .