I have heard that Marriage changes a relationship for the worse. Has anyones relationship ever got better?

Has your relationship or anyone you knows relationship got better with Marriage?

Their is no such thing as a perfect marriage or a perfect partner relationships, so why get married or get into a serious long term relationship -right?? But every single night, I enjoy hot sex with my wife, day in and day out! For the past 14 years of marriage. I get to hug her, kiss her, caress her, snuggle up tightly every night, even though we both have heated arguments at day time.
Enjoy the moment of happiness now, because tomorrow may never be the same ever again. Just take your not so 100% perfect marriage life one day at a time. Thanks God for the creation of a beautiful woman. My life would really suck, if women in this world did not exist. Cheer Up!
edit: If U R 100% healthy with no health problems, then live it up to the max! 40y/o Life of a Party husband here!