What undergarments do your characters wear?

Like the topic? What can I say? This morning this question struck me.

What do your characters wear for undergarments? Do the womem all wear thongs or "granny panties"? Why? Is it because that's what you the writer wear or is it because of something your character has revealed?

And if your character sleeps in a G-string, have you ever? I mean seriously, have you ever worn a pair to bed and woken up with the string some place it just should not be?

Do the men wear "tight whities", Speedo type underwear, or what? Again, why? Especially the Speeedo type. Ick! I would gag if one of my characters did that. That's like going to the beach and seeing these bigger men walk around in the "barely-there" swim suit thinking they look sexy when in fact their wife or girlfriend should tell him to go put on those white socks and flip-flops because then his outfit would be complete.

Seriously. How many of you describe that part of your characters wardrobe? Including what color are they or the type of material? Does the heroine always wear silk or does she occasionally wear cotton?

Is there ever any humor involved when you show these undergarments? Like what?
Like does the hero get caught going commando? Who catches him. . .the heroine?

These are all very interesting questions. Let me know.