There is a specific trend that I've been noticing in some of Beckett's scenes, where he leans in towards the other person he is talking to and lowering his voice.
I like to think that he does this during a negotiation or an attempt to intimidate the other as a last resort. He THINKS he's being intimidating/convincing but all it does is make him look like he is flirting and or attempting to seduce them instead, since it increases his charm by tenfold.
Also. I like to think that a handful of the main characters were gay for Beckett at least once in their years of living. Just once. Hence why most of said scenes have a strange sort of homoerotic tension to it.
Summary : Beckett stop flirting with everyone and charming your way through things, you slut