I would say it's common. I have had guys ask me if i wanted to see them wank. I give the Rock's eyebrow at the message and say “no thank you.” Been getting asked this question for years. When we do a pic exchange, I learned let them send their first. 9 times outta 10 it's a penis. Probably not even theirs either. So in return I have a pic of my big toe I took and send them that in return. They can see how I color my big toe. Then they all pissy when they see that. I say to them “well since you won't show me your face, i dont have to show you mine either.” When people ask me for exotic pics i say to them “no thank you, i dont need them on a porn site.” They usually say something like “oh i never send them out.” My reply is “yeah i heard that one before then why do i keep getting my pic returned to me in an email from a friend who sent it to them?”