Comartemis said: You'd think that after all this time he'd have built up a resistance to naked women at some point. But nope, it's still "BOOBS! IN FACE! OMGWTFBBQ!"
If you read the chapter you will notice that caused him to get a boner.
It's his expression here that bothers me more than anything, like having a naked woman literally fall into his lap is something new to him and not something that's been happening regularly since day 1 of the first series.