ThomasX's response is pretty good for a direct approach. Here's some responses I would use in this situation:
"too bad i'm 674 in that area"
"mmm... okay but try doing the square root of 673 in your head! this equation will definitely help: me + you = bed"
"I think I just found the world champion of awesomeness in bed"
Just be creative, make it suggestive, use your intelligence and you'll be fucking her in no time.
Phoenix - "Women want sex as much as men, they're just generally less forward about it"