My son, now 26, loves anime. I think it is kind of sexual, but he loves the artistry and the videos and the whole genre. His wife, who is quite the feminist, used to hate it, but has learned to appreciate it and the cultural aspects. They went to comicon recently and showed me some pictures they bought. Very beautiful work.
There are some works that are more sexual and include bondage however.
There is a difference between mainstream anime and what I think you may be thinking of, and what I first thought of when anime was brought up... a form called "lolicon". If he was into it, it'll be on his computer.
Anyone know if there's been a warrant issued for his computer?