I have a really weird question

No because if you have a virus that can get through the no doubt state of the art security system, you would be far better off with either a Trojan virus or a data mining bot. You can gather important Intel that way. If you send them porn then all you will do is alert your enemy that you can hack their computers so they know to change security systems.
Basically you can either troll them once, or gather Intel several times, not both

There would be no logical reason why you'd want to send an enemy military porn virus. As Mauser said you can gain intel multiple times not troll. Plus id like to add something however. When it comes to entities playing a logical game of chess before you wonder why wouldn't they do xyz thing. You must also ask yourself what will they gain from it. Militaries won't fall for stupid shit like porn viruses.

Well if it's malware or a virus, that's a start, but putting a bunch of images is of course, going to give rise in attention to the enemy that you obviously did something. Something better would be stealthy. Also, you're most likely after gathering enemy data and intelligence, not just sending a bunch of images. In terms of contributing to the battle, you're better off keylogging or accessing their confidential information.