Between the acts of La Traviata we were discussing the plot of the novel La Dame au Camellias of which La Traviata is an incarnation. Apparently La Dame wore white camellias when she was available and red ones when she was having her period. When she met Alfredo, or whatever his name is in French, she gave him the red camellia and said he should come back in a couple of days. This makes complete sense. Making them jump into bed at the end of the scene doesn't.