The actress known as Savanna Samson once relished preparing for a role. “I couldn’t wait to get my next script,” she said.

There’s no reason to look at them anymore, she said, because her movies now call almost exclusively for action. Specifically, sex.

The pornographic movie industry has long had only a casual interest in plot and dialogue. But moviemakers are focusing even less on narrative arcs these days. Instead, they are filming more short scenes that can be easily uploaded to Web sites and sold in several-minute chunks.

“On the Internet, the average attention span is three to five minutes,” said Steven Hirsch, co-chairman of Vivid Entertainment. “We have to cater to that.”

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