I hope you don't mind if I point out the flaws in your plan.
1st:
You don't just marry a girl. You will most likely have a relationship with her first and sex is a very important part of a relationship. You don't just decide to spend your rest of your life with someone. You don't want to marry someone and figure out he sucks in bed afterwards.
Which leads me to point #2:
You don't start skilled. You have no experience in sex and will therefore quite likely suck.
I see it that way. When I decide to stay with someone I prefer being prepared and skilled enough to please her.
And I talk that with my girl friends and they say it's no problem having no experience because you can improve your skill in less than 3 weeks :3