Good luck with it, but your comparing two different things.
Sex.com sold for a huge amount, not s3x.com. It looks cool, but it's not the actual word so i don't think you'll get alot more than what a regular domain name costs. I don't think people looking for tits will type in t1ts.
I am the first to say i know nothing of selling domains, or much of anything for that matter, but i don't see that domain name being any kind of real payday for you.
I really hope i'm wrong and you get a shitload of money for it though. best luck
