Men who are trying to father a child are now being told to have sex everyday. The theory behind this is the fresher the sperm, the higher the quality.
When sperm sits in the epididymus for two or three days between intercourse, the old standard, the sperm count increases, but the quality of the sperm decreases. The longer the sperm sits, the higher the frequency of genetic defects in the sperm.
I, for one, am glad to hear this news!