For me, I really don't know. What is strictly pornographic? Any depiction of sex... seems too careful.
For the second question, while everything of course should be skipable... If you, for example, roleplay a great seducer, adventurous sex seems like part of the ride. Not every NPC has to offer the same flavour.
Companions... romances like Lae'Zel's are different from Shadowheart and that's fine. It's part of fleshing out the character and romance.
