'Proof' as you refer to in your final paragraph, is not possible...
BUT, please take a look around these forums for other posts that relate to this overall subject.
As a very short 'starter' for you...
Yes, it is possible for people to unwittingly download a file that, when innocently opened, will direct the users machine to from one to thousands of different 'porn sites'...
You will see numerous posts here related to this same problem...
Most from either parents or older siblings concerned about younger children...
(And, of course, since all husbands and boyfriends are just younger children, it should be useful to you !)
I should also quickly mention that the 'bad files' with links and such are not confined to one particular size range or type... Whether it is some 700MB mega-file or a 300kB eBook file, there could be included such garbage...
Last, keep in mind that many totally innocent people have spent long times in jails and courts because of precisely the same things and the same instant suppositions of guilt. I am sure you can probably think of numerous famous people who have been burned this way when they were in fact completely blameless.
p.s. With your nick, one hopes that you don't finally do him in with a pendulum !!!
