Unless you want to be rid of them. You'll never get them back. You'll forget whom you
lent them to and when. Then, when you go to look for one, you won't have a clue where it
is. Books are one of those items, like borrowed money, people feel they don't have
to return. Tell them it’s available at the library.
Some guys don't remember to return things they borrowed from you like books, so the best solution is not lent out your books at all. I had very bad experience about this, so now I have learned a clever lesson.