Iron Man 2 introduces the MCU’s first female superhero in Black Widow and wastes no time in having Tony, Happy, and especially the camera ogle her. This behavior is lampshaded in the dialogue but it's ultimately played off as harmless, just "guys being guys."

I know I'm spending a lot of time on Iron Man 2 but as I said it really sets the tone for the MCU as a whole. For example, it gives us the first (of many) butt shots of a female hero. It wouldn't make it any better, but you won't see men framed this gratuitously by the camera.

Another trend we see in Iron Man 2 has to do with how male friendships are depicted in the MCU. Tony and Rhodes mend their relationship and bond by the end of the movie but not through communication or mutual emotional support. Instead it's through a joint exercise in violence.