From the very positive Total Film review that i read (4 Stars), it's apparently aimed at both. It's got "chick flick" elements, but it's balanced with a hefty dose of gross out "guy style" humour.
It got the 'Movie of the Month' award in Total Film too. Personally i loved 'The 40 Year Old Virgin' and i'm looking forward to this (regardless of whether TheFreeviewGuy thinks i'm an "idiot" or not...).