Only four of which in which he was actually clothed.
And in case that wasn't enough, the internet knows just how adorkable he is while wiggling out of his boxers. So I'll just leave this here.
By way of bonus:
Because they actually made decent points while doing it:
1. Chris Evans
2. George Takei
3. Misha Collins
4. Because he was his usual awkward baby giraffe of a self: Matt Smith
5. And simply because he's the Smiddlesbatch triumvirate would be incomplete otherwise: Tom Hiddleston