Also wanted to let you know that I didn't see Dynadot listed on this Domain Name Wire blog post about registrars offering XXXs, so I added a comment, letting them know you'd be offering .xxx as well. The site admin notified me that he didn't see Dynadot in ICM's official registry list (see post comments)...?
.XXX will be available through the API, but probably not immediately when registration opens, so if you are wanting to grab some, it's probably better for you to place a pre-order.