I thought this was a good column from the Times Online: Touching Shouldn't Always Mean Sex.
Relationship expert Pam Spurr points out how hard it can be for male/female couples to send and understand signals about touching. Sometimes, you don't want sex, but you need to be touched and held. She points out:
When our skin is touched, our bodies produce various responses including producing oxytocin, the emotional bonding hormone. This makes us feel good around our loved one. That heart-warming feeling means that we want more of their company. And so the cycle goes on bonding us together.
Interesting that most of the comments are very hostile. I agree it's a bit of a stereotype that he wants sex, she wants to cuddle, but certainly mismatches in how much sex people want are not uncommon.