Background: women's appetite is lowest for the 3-4 days right before ovulation. It's due to the big spike in estrogen. This proposes a theory of why that might be the case that effectively comes down to
"Women lose their appetite for other distracting things such as food so that they will have an appetite for another kind of meat."
And by meat I mean penis. In case you weren't clear.
http://www.ncbi.nlm.nih.gov/pubmed/12661507