I am 26 years old and my foreskin is still attached to the glans. I just noticed that most men have it detached from the glans. I don't have any problems when I have an erection. I can pull it as far as I can and there is no pain. It comes back again to cover up the penis in its normal state.
Is it important to detach it from glans? Just want to be sure before marriage so there will be no problems in sexual intercourse.
It is possible that it won't cause you any problem, but typically problems do become noticeable during intercourse because you have less control over the movement of your foreskin and there is a strong likelihood that it will pull. You can try the stretches suggested to see if you can encourage it to detach. You can also wait until you are married and see if sex is uncomfortable or not. If you have not problems, then you do not need to do anything.