I think it depends on the name you are using. If it is a modelīs name like the mentioned raven riley, itīs not ok using it without the sponsorīs permission.
If the domain name is more descriptive, like "gag on my cock" for example, itīs no problem unless it is a registered trademark.
Thatīs of course the european view. I really donīt know the us laws well enough to judge about it.
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