Just as the Bible charges husbands to be the loving head over the wife as Christ is the head of the church, I think that boyfriends should be Leading the charge in a relationship. Charging Towards holiness, Charging towards regular church attendance, Charging towards praying together, and Leading The Retreat from impropriety, or the appearance thereof.
I'm not uberly puritanical (Dost thou come to theses barn raisings often?), and my girlfriend and I have been out past one in the morning. I am, however, planting flags and staking claims in my relationship. Not in a creepy, sexist kind of way. In a anachronistic, old fashioned sort of way. The flags I plant are God's, and it is in His name that I lay claim to chastity, purity, respecting one another as well as Our Father... I've never had the privileged of being a spiritual leader in a relationship. In my marriage I was rejected when I tried to lead. Prior to my marriage, I was not sufficiently spiritually grounded to have the desire to follow God so boldly. Early on, I put my foot down and defined that my expectations for physical affection were that we would not engage ourselves in behavior fit only for married persons, but also that we would yield to whoever had the more conservative boundaries on that. I have persisted by striving at each step to be Genuine about my faith, and to share it at every opportunity. Before we ever dated, she saw me pray with my children. Now that we date, I would be remiss to not pray with her.
Fellas, I tell ya... Stand up and be a spiritual leader in your church and community. When a relationship comes your way, take the same stand. If she does not cotton to it, if she grouses about anything that you do in God's name... flee from her. (My first wife was a grouser, and that ended predictably.) If, however, she brightens up when you sincerely take a stand, planting God's flag as claim to your relationship, then you may very well have someone whom you may someday pledge confidently to honor the rest of your days.
Still is Right. It must come from within. It must come natural. It must be genuine.
Figure out how to honor God in your life, and then honoring God in your friendships, your relationships, and should God have such in store for you - your Marriage, will come natural.