The adult sites you are talking about may have placed "Crisellen" in their meta keywords, so that a search engine will produce their URL when this word is searched. There could also be a possibility that these adult sites that are produced have the word "Crisellen" in them, so Google picked up the site.
quoting me saying things I never posted.
I didn't find this in Google. Why don't you give me the link (Please disable it by putting a blank in between so that users do not accidentally click it)?
In any case, I don't think that this is due to a virus.