Generally speaking, Norwegian law is clearer than U.S. law as to what is permitted and what is prohibited in terms of publication of sexual images. 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.