Use no excuses...
Just leave two bikes over at your best friends garage, like I do.
This solves two issues.
1. Outta sight outta mind.
2. It guarantees you'll stop by and visit with your buddy regularly.
As far as your wife sees it, you only have one bike around at a time.
'"This whole memory lapse is gett'in to me. Hopefully I think I'll outgrow it."