That requires hard work. Probably many hours of counseling. Start with a close friend who is mature and has dealt with these kinds of issues. People damaged in this way have to learn how to form true relationships. Re-wiring a brain that has been conditioned in the wrong way requires many hours of behavioral therapy/sexual reconditioning and the help of trained professionals is generally needed.

Remember: a persons' brain is an actual, physical organ - and it can continue to "learn" and change well into a persons elderly years. You can teach an old dog new tricks, but it is harder and it takes longer. Remember the story of "The Tortiose and the Hare?" The turtle wins the race.

If you are trying to help somebody in this way, it will be important for you to do some serious research online regarding sexual reconditioning and behavioral therapy. Buy and get your hands on some good books on the topic.