Not to diverge, but the earlier suggestion to get the other halves to learn to dock is a very good one. Not just because of the fender-tying issue...
Consider that if you were incapacitated for some reason… how will she/he be able to handle the boat? You'd be fairly screwed. It is so important that everyone in the crew be able to cope with this possible eventuality.
And the other halves do indeed need to know how to tie knots and that quickly, for the same above reason. It may be desperately necessary at some point. Frightening, but possible.
Besides, it has been my observation that (I'm assuming women here) tend to have a lighter hand on the helm and thus have gentler docking skills