It dosen't open links to adult site. When you open this link unit 'Blue Movie' it shows normal ads. but the keyword Blue Movie is adult.
Try to get a main keyword as much as possible so that you will get the ads that you want, or you will have only the crap ads.
Your computer is infected I reckon. Mine was also a while back and google ads were being substituted with Sex ads. This is not on client PC's though, so nothing to worry about in your case. Do you also get lots of sex ad popups? That is sure way to tell.
If the ads are really sex orientated then you are not viewing Google ads. Take this into account also. Google do not accept sex ads at all. Maybe gay hotel ads or meet gay personals etc, but nothing graphic at all.