Moviefone lists "8 Things We Learned at 'The Avengers' Panel at New York Comic Con" and muscle talk was one of them:
Chris Evans and Chris Hemsworth Like to Talk About Muscles When They Are Out Drinking
Hiddleston (while answering one of the 200 questions directed at him) relayed that on a drunken night on the town in Albuquerque, while the rest of the cast was dancing up a storm at an Albuquerque nightclub, Evans and Hemsworth were chatting in the corner, talking about triceps. Also, Gregg relayed that on this very night, Evans put the night out in motion by sending a text that read, "assemble." Cute.
There are few ladies who do not mind this conversation in the least. Read the remaining 7 interesting facts here.