I'm traveling to Iran and i need to bring my laptop.

For western standards I do not have anything illegal on my harddrive but since I'm not familiar with the Sharia I'm a little bit paranoid.

1.) Is it dangerous to have, for example, holiday pictures of girls in bikinis or similar on your laptop? Is it common that laptops get searched or am I just paranoid?

2.) If that is dangerous, how should I proceed? I need to take my laptop with me. Should I encrypt everything? Given the fact that browsing the internet already caches maybe dangerous pictures and it is very hard to be sure that one has deleted all of them, how should I clean my laptop?