"While traditional rights protection mechanisms, such as the Uniform Domain Name Dispute Resolution Policy (UDRP), will apply to .xxx domain names, and while ICM Registry has implemented a host of other protection mechanisms that will aid trademark owners seeking to combat infringing - or simply disparaging - use of valuable brands, trademark owners should consider 'pre-reserving' and/or defensively registering key .xxx domain names containing valuable trademarks." Advice from this
Foley Hoag LLP post.