I have limewire and it was downloading kiddie ???

My husbands friend was over here and they were downloading songs, my husband wasnt really paying attention to what his friend was doing and the next day i got on and there was all this kiddie on there. my husband is determined to try and find some other reason it is on there. he did some searching and came to the conclusion that it had to be a hacker. I do not believe this is the case. number one i have just lastnight did a complete scan of my comp for malware and virus' and i dont have any.two i dont believe a hacker is just going to get in my comp to download ,they have easier ways to do this like getting an external hard drive, third there was like twenty files downloading, and they were mostly of asian girls which his friend is into asians .. so i am lead to believe that it was his friend. what do you think??/ does anyone know much about this kind of thing?? please help if it was his friend i dont want him around my two year old daughter .... thanks