Satan is very close to porno. Avoid depictions of sin. Also, avoid wishing you were having real sex with the person in the picture. No harm done. I don't think so.
Oral sex is similar, but more dangerous than petting to climax, because bodily fluids are exchanged.
Dating With Real Sexual Intercourse Be very careful here. You and your partner can both get hurt badly. Many people can be sexually satisfied very well without actual intercourse. Such a strong tradition, held so long by so many Christians, should not be lightly disregarded, even if you can find no scriptural basis for it. If you are close enough to somebody to be having intercourse with them, maybe you should go ahead and get married.