Sex means a lot to me, and I think it's abnormal to have no desire for sex. There are people who identify as asexual, and they're fine with it, and they even find mates who also identify as asexual, and if they're ok with it, that's fine with me, but I think they're abnormal. That said, I wouldn't try to "convert" them. I think, even if someone or something is abnormal, as long as it doesn't hurt anyone else, s/he should be free to live that way.
I think sex is a wonderful thing. I don't have a problem with people who have multiple partners, as long as they're honest with those partners, and don't think less of those persons. But for me, I prefer monogamy, at least in a relationship.