There wasn’t any confusion about cybersex. Like phone sex before it, cybersex was the acting out of sexual performances via internet. Sexting is the same thing. If I tell you I want to make out via text, I’m not sexting. If I say I want to rip off your pants and push you up against a wall (in a sweet way!), I’m probably sexting. If you send me back a naked picture with a reply to that effect, now we’re both sexting.
If I just send you an unsolicited cell snapshot of my junk, I’m not a sexter—I’m a pervert.