Is google threating adult websotes differently like normal sites in the pageranks?

Thanks for your answers!

[Signature removed. -Philipp]

Hard to tell from the outside, I bet Matt Cutts knows!
In a search for [porn], what I assume to be a highly competitive term, these are the top 4 results Google.com (logged in/ logged out the same, always without SafeSearch) along with their PageRank:

1. www.keezmovies.com PR4
2. www.pichunter.com PR5
3. www.twelvefifteen.net PR5
4. en.wikipedia.org/wiki/Pornography PR7 – the first non-adult page, actually