One of my Indian friends now living in North America recently got married to a girl via an arranged marriage. He claimed that sex wasn't important to him, yet he's a self-proclaimed porn addict. To each his own, but I wonder about how his wife will feel if his addiction continues and he grows cold and distant. Before getting married he had only met her briefly face-to-face on a visit back home.
If you find someone fairly attractive, then the sex is not important so long as both parties are somewhat functional. "Good sex" is learnt, nobody was born with this ability. If both parties are patient and willing to go through it together, they will succeed.
Point taken, you learn together overtime and discover things. I was more referring to this specific case, where porn and its potential to affect desire/frequency may be an issue. Again, to each his own, they can do what works for them.
Edit: sexual compatibility is very important.