Yes to me it's cheating. It's not porn because your talking to these people. And imo I feel that only your girl/guy should send you nude pix
If you are pursuing other women electronically and being reciprocated with nude pictures, and all this is behind your partners' back, and you know they wouldn't appreciate it, then you are being emotionally dishonest with them.
This may be the best answer thus far to this thread. Me and others earlier said that if it's dishonest, lying about it, etc... then it is or can be cheating. But the term you used "emotional dishonesty" is actually more accurate. It may not be physically cheating but it's just as bad, IF NOT worse, if it's something emotional instead.
No, there is one restriction: I can't fuck my friends. I don't agree with it at all, but I respect it. If I'd disrespect it, nothing would happen, he'd learn to live with it. But I won't do it. I'm not mean.