That's the question most women seem to think men struggle with. Truth of the matter is, we don't struggle with it, in fact, we absorb it. So much so that in the seconds between the question being asked and giving an answer, a man's mind is working it's hardest, not because it's difficult, it's because we think about it a lot. Hopefully the comic below will explain....
I suggest you click on this link to view it full size:
Credit goes to.... you know who you are!