Responsa על כתובות 121:11

Those who throw keys or money into the hands of their wives during their menstruation period, should be sharply rebuked. Throughout this period until her immersion in a ritual bath, the wife should put down such articles for the husband to pick up, and the husband should put them down for the wife to pick up, but, throwing articles to each other at this period is prohibited.
SOURCES: Cr. 124.