I have no problems with it, but you may want to consider following theymos' rule from
Advertise on this forum - Round 272:
Ads may not link directly to any NSFW page.
It's nice to get a NSFW-warning after accidentally clicking a link.
Interesting, do you know if these rules only apply for the auctioned off ads that theymos runs or for all ad campaigns? A landing page that asks if you want to continue to the NSFW site may be necessary otherwise.
I believe they only apply to the forum ads. AFAIK theymos does not have any rules that signature ad campaigns must follow. I think I would go with the landing page to be on the safe side though, as people could accidentally click on it.