May 08, 2015 - 01:59 PM
It might be a good idea to attend a doctor's appointment with him and preface the physician's nurse ahead of time about the issue that the doctor may be able to bring it up, benefits of use, etc. Sometimes it's a simple as a third party mention to make it click!
May 10, 2015 - 02:34 PM
It just might be that he is embarrased that you brought it up.
If he was able to just take them out of the drawer just like always and just like "real" underwear he just might be a little more at ease with it.
When you notice he is running a bit low just replace more in the drawer.