they will have sex at the end of the season then it's true. TV Guide printed this -
"No dream sequence here. No undercover assignment. Not even alcohol. After months of teasing, creator Hart Hanson confirms Bones and Booth will hook up in this year’s season finale. “They’re actually in bed having sex,” Hanson tells me. “And they won’t be able to just walk away from what happened. It will have serious ramifications.”