And probably, there's not going to be some definite answer on which gender wants sex more. Different people have different libidos -- some men might be less horny after a crappy day at work; some women might skyrocket after a kick-ass workout. When we start sexamining men and women, we have the habit of dividing them into these two discrete groups and assigning them characteristics. Then we start to only see the patterns we want to see and stop seeing the nuance and incredible variance of the sexual desires of HUMAN BEINGS.
So how do we know what our partners want, if they're horny little beasts, or subdued cuddle monsters? Well, the biggest lesson of all sex research is that people vary; they vary by every single characteristic you could throw at them, they vary by mood, by season, by lifespan. People's sexual desires vary. And that is good news for men, women, and everyone in between. Because now we know: all you need to do is ask.