How can you be married and not have sex?
I don't see marriage, sex, and/or love as being linked together and inseparable, first of all. Maybe it's because I'm an intellectual, but I believe it's possible to love someone in a Platonic manner, meaning, love and/or marriage minus sex. I consider sex as a bonus in the context of marriage. It doesn't have to happen, but if it does, then great. What separates us (humans) from the rest of the animal kingdom is our intellectual abilities, the ability to reason and think rationally, to think outside the box and outside our sphere of comfort. That means being able to regulate/control certain instincts we all have.
Two, just because someone is asexual (like myself) doesn't mean they don't need intimacy and/or a partner. Everyone has the need for intimacy. No, intimacy is not sex. Intimacy might be a step -toward- sexual relations, but they're not one in the same. Intimacy refers to a feeling of closeness, vulnerability, being able to share your thoughts/feelings with someone, belonging, etc. Everyone has it, even people with low/no sex drives.
Finally, sex within marriage isn't safe sex. It may be -safer- sex, sure, but the only safe sex is no sex. With sex, you take a lot of risks. The question of your partner's sexual past -does- and -will- come into play. If indeed sex really is the physical expression of love, something no word can describe, then that's pretty intense. That also means any feelings -after- sex are also intense, especially negatives ones: feelings of insecurity, jealousy, envy, inadequacy, suspicion, etc., which can complicate, even dissolve the relationship, especially in modern society where views and attitudes on premarital sex have been relaxed, even in Christianity today.
So for me, in short, it's the fact that I can think outside the box and see the other, more important functions of marriage (sex being on the bottom of the list, even not on the list), the fact that everyone needs intimacy in some way, shape, or form, and the fact that I'm aware of both the physical, mental, and emotional dangers associated with sex today and that I want to safeguard myself from any distress. Some people, like myself, are stress-prone and stress-sensitive, so the less stress in our lives, the better.
My view on this is, of course, a minority view. It's a view the majority won't agree with. It's even a view the majority will probably try to change my mind about and try to prove me wrong, when there's no right or wrong about my decision. It's simply a decision on how I want to live my life and a decision that I think will make my life the most enjoyable.
And with that, I'll start waiting for people to post tl;dr to my reply. :v