'talk intensively' is correct and can be used in written English.
It is often used to indicate that two people had a long and thorough conversation. For example, "John and Sarah talked intensively about the upcoming meeting."
Over several magical meals (I'm honored to call him a friend) we talked intensively about his research for this project and I couldn't wait to read the final version.
"We're already talking to NIH and we'll be talking more intensively about what's possible to meet the enhancement requirement," Gabel says.
His North Korean counterpart in the talks, First Vice Foreign Minister Kim Kye-gwan, speaking across town at his country's diplomatic mission, said the two sides had made "big progress" in talks that focused intensively on trust-building but they had differences they couldn't overcome.
The next condition, Abbas said, is that the talks focus immediately and intensively on determining the border between Israel and a future Palestinian state.
That concern is most intensively reflected in open talk by those who say they do not want their children and grandchildren growing up in an Israel threatened by a nuclear-armed Iran.
In recent days, the people close to the talks said, Germany's demands focused more intensively on securing long-term job guarantees as well as locating at least a division headquarters — possibly the Eurocopter helicopter business or the Astrium space activities — on its soil.
The two talked about arrangements, and spent two days intensively analyzing the album's songs.
But the two had been having those intensively as part of six-party talks that include South Korea, Japan, China and Russia.They stalled a year ago over the Bush administration's efforts to get Mr Kim to accept plausible verification of steps towards the dismantling of his nuclear programmes, for which he has been promised large dollops of aid.
And not least of all, in this intensively record-conscious summer of sport, he is surrounded by talk of his chances to make tennis history the next two weeks.
