It seems that sex.com has requested that their results be removed from overture's suggestion tool (meaning the overture results for "sex.com", including the extension).
However, the results for "sex com" (with a space) is 243846.
Now,
"pussy.com" gives 45003
"pussy com" gives 985
So:
45003/985 = 45.7
45.7 * 243846 = 11,140,915
So, I'd say it's safe to estimate that "sex.com" got searched around 10 million times last month. It's purely guesswork, but you'd have to think they'd be getting at least 5 million uniques per day.. That's huge.
Assuming their conversion ratio is 1:2000, you could speculate they're hitting $100,000 per day.
Although, I agree with Cyphix - it's likely to be a lot more.