“Who in their right mind would be sending shirtless shots of themselves.”
How about tens of millions of men and boys, who send snaps of themselves at the beach?
Read this too:
http://www.freerepublic.com/focus/f-news/2959967/posts
"This photograph shows FBI Special Agent Frederick W. Humphries posing with target dummies following a SWAT practice. This is the "shirtless image" that has been alluded to in the investigation into emails that led to the resignation of CIA Director David Petraeus.
Humphries sent the 2010 photograph to many people, including Tampa socialite Jill Kelley and a reporter at The Seattle Times."