I'm a little surprised that (a) this surprises _anybody_, and (b) that there are plenty of Slashdotters who are convinced it's lies and propaganda.
You're making the mistake that because Bin Laden subscribed to an ideology that was sexually repressive, he must also have been sexually repressed. This isn't the case. The sexual mores of the conservative (read: fundamentalist) Islamic world are pretty twisted; the reason burqas are mandated for women is because the men supposedly can't help themselves if shown a bit of ladyflesh, even a bare ankle. The onus for sexual purity is placed almost _entirely_ on women (which sounds a little like the US, come to think of it); it's no surprise, then, if Bin Laden is a total pervert.
Honestly, I'd be surprised if there _wasn't_ porn in the compound.