Multiple sites linking back with pornographic anchor text

[GeorgeMaven]

I discovered a while ago that we had quite a number of links pointing back to one of our customer's websites. The anchor text of these links contain porn that is extremely bad. These links are originating from  forums that seems to link between themselves and then throw my customers web address in there at the same time.

Any thoughts on this? I'm seriously worried that this may negatively affect the site.

[brycebertola]

I've heard of black-hats linking to competitors using adult websites and terms to catch their competitors in the safe search filters. I'm not sure that's what is happening here, but I'd keep an eye on it.

Have you seen any drop in organic since you started noticing these links?