The glans covering is actually a mucous membrane, not real skin. Generally channelling or wrinkling abate swiftly. In some circumstances there might be a condition called "keratinization", but that’s not a big problem to deal with.
The darkness can be dealt with by chemical peels (quick) or Firegoat rolls. (slow). PE has made my unit quite dark, but Mrs. Andy doesn’t care, and neither do it. There are some threads on the cause and the cure.
PE shouldn’t affect fertility, but it’s one less thing for her to worry about, so putting it off for a while is the reasonable thing to do. You can plan the next program while you wait for her to get knocked up.