That has to be the vilest sickest suggestion I have ever heard. Im sorry but your wife creeps me out, using a cup? Oh god.Major difference of opinion here.

Anything the body expiunges be it excrement or menstraul blood is usually expelled for a reason!!! Therefore why on earth would anyone sane want to use it as fertiliser on something that goes back into the body.
Menstrual blood? Ive heard it all now.
LOL