 While Booth and Brennan maintain a professional relationship and friendship for six years, there is a deep emotional attachment and hints of romantic and sexual tension.Minor characters constantly mistake Booth and Brennan for an already romantic couple, an accusation which they consistently and vehemently deny, although they spend more and more time together outside of work and a sexual attraction between them develops.Although she refused to admit it at first, Brennan enjoyed working with him from the beginning, even after their falling out when Booth got her drunk and "fired" her, and, in Season 1, she cajoled him into launching an investigation after finding three bone fragments on a golf course so he could work with the Jeffersonian team on the case despite the fact that the FBI had no jurisdiction.