Mormonism is not meant to be a casual part of a Mormon's life but it is meant to be the center. Today was my birhtday and my husband spent the whole day at work and all night working on his notes. The Church of Jesus Christ of Latter-day Saints teaches that all sexual relationships outside of marriage defined as the legal union between a man and a woman are sinful.
Marriage is unbelievably amazing and indescribably painful; I have been at it for 28 years with my soul mate.
As Joanne mentioned, should you marry interfaith, you will have lots of help from fellow ward members on converting your tino berliner lust