"I withdraw the question.  Maybe you don't find them monotonous but none of my business, either way.  But if you don't want Mike's feet kicked out from under him by the first five hundred women that get him alone and I don't regard it as a good idea, either; he should have other interests as well - then don't try to intercept his mail.  Letters like that may vaccinate him a little ... or at least tend to put him on guard.  Don't make a thing out of it; just pass it along in the stack, cum 'filthy' picture.  Answer his questions if he asks them... and try not to blush."