Flashing has always been sexual harassment.
Some things in life should be opt in, not opt out.
Women flashing their breasts in public to breastfeed is apparently not harassment because its 'natural'. There are women who will publicly post pictures of their breasts hanging out while a child sucks on them just to force the point that it should be acceptable. Guess what is also natural? Sex. The thing that makes the baby that is being breastfed.
(for the record I dont think a minor should be exposed to any nude non-family adults after a certain age, so this dude is still a perv for sending pics to a 15 year old. It begs the question did he know how old she was? This IS the internet, after all).
If you teach your children to like computers and to know how to gamble then they'll always be interested in something and won't come to no real harm.