Revenue from mobile adult content is expected to reach $1 billion worldwide this year, driven by the increase in sophisticated services that deliver video clips and streaming video, in addition to text and images, a research firm said Friday.

The 50 percent increase in revenues predicted for this year over 2004 will mostly come from Europe and the Asia-Pacific regions, Juniper Research Ltd. said. But porn fans in North America, especially in the U.S., are expected to boost revenues past the $400 million mark by the end of the decade.

European customers are currently the biggest spenders on adult content, with an average annual revenue per user of more than $34.

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