As an asexual panromantic person, hi!
I’m not currently in a committed relationship, but I have been in a few, and, yeah, there can be complications- but that happens in any relationship, right?
Sex is something some people want, and there’s nothing wrong with that. I’m just not one of those people. I want snuggling and movies, and reading books together, and ranting about all the computer games, and picnics, and everything else that generally happens in a relationship.
And when they want sex, I explain- I tell them from the beginning, and totally accept it if it makes them anxious, or uncomfortable. Some asexual people may be rude about it, and say relationships shouldn’t be built on the need for sex, but asexuals should understand that it’s something a lot of people attribute with comfort, respect, and intimacy.
I have been in a relationship with a monogamous non-asexual person, and as long as we communicated, we were fine. Honesty is important in all relationships, and this is just another thing to communicate about. ^^ Hope this explained some things.