Deep linking Question

Hi People :D

I have a question, i hope someone in here maby can help me whit.

On my site, there is alot of "girls pictures" and i maby think some sites "deep link" to oure pictures. = they use oure pictures and bandwide :|

Is there a way, so we can prevent people to deep link to oure site?

I know most "porn sites" have a forum of deep linking block. So if people deep link to a picture. the picture is not shown ore there is a images shown where there stands (Error) ore something.

Hope someone in here maby can help we whit this.. :)