MCU: 11 Things You Learn Rewatching Iron Man 2
7. Tony Wanting To Bang Black Widow Is Really Weird

Black Widow (Scarlett Johansson) joins the MCU in this movie as Tony Stark's new assistant "Natalie Rushman", who Pepper (Gwyneth Paltrow) almost immediately describes as "potentially a very expensive sexual harassment lawsuit."
At the time of the film's release, Tony and Natasha's flirtatious back-and-forth didn't really seem like a big deal - even with Downey Jr. being almost two decades older than Johansson - especially once it was made clear that Natasha was working undercover with S.H.I.E.L.D.
However, Tony makes numerous references throughout the film to Natasha's hotness and his general desire to bang her ("I want one"), which almost a decade later, with the two having worked side-by-side in a professional capacity for so long, just feels...wrong.