...fidelity and true companionship!
Marriage is like having your best friend around all the time. So, a person can share their happiest moments with someone they love! But also, in a marriage you have someone there for you even in your lowest times. Those moments when you need loyalty and honesty you will have that. Having a companion means fun all the time and a relationship that would be enjoyable all the time.
...more and better sex!
A popular belief in America is that marriage ends sexual fulfillment. But, in all actuality married men are having sex more often. The sex is better than cohabitants too! Because married sex is more emotionally fulfilling. It is more likely to have sex with your wife than it is to find someone out on the weekend to have sex with.