Namedrive allows them for sure, I'm not getting great revenue but I think it's as good as it gets these days and there's a few cents of separate popunder earnings but they need much better adult templates, they have some stunning ones but not for the adult themed landing pages.
Surprisingly, the old Parked.com, w/all its issues of what you can and can't do under the Yahoo feed rules, gave me some income on some names but when they changed to Bing they became much lower. Now they're DomainApps, same feed problem, I would not waste a good XXX name w/an inferior feed. The only thing both the old Parked.com and DomainApps do well is get me sales inquiries, which is most unusual for a pkg co that does not use Google as its feed. Adult names or not, I still get most of my sales inquiries that come from parked page FOR SALE links when the name is w/Parked.com, now DomainApps
Sedo SUCKS, period. For a porn name I'd rather have a stale page w/no pictures at all than use those