Norwegian obscenity standards have nothing to do with subjectively determined criteria, such as whether or not an image has redeeming artistic merit, or whether it violates vague and changing local community standards. Photos showing sexual penetration are against the law. So are photos showing actual oral-genital contact, sex with animals, or sex with children under the age of 16. Aside from that, you can publish what you want. Erections are fine.
Bodily fluids are fine.
Hands on cocks and cunts are fine. Hot sexual energy is fine. What you see is what you get. Norwegian obscenity law basically lets publishers know where they stand. How different this is from U.S. obscenity law, which is designed to keep sex publishers perennially guessing.