Sulu wasn't used to them and honestly didn't find them all that comfortable. It wasn't like it was that big a deal, but still... The less they had to deal with, the better. So, Sulu just grinned at Ianto and rolled his hips, raising a brow at the question.

"I'm from a century where we don't have sexually transmitted infections; I know you don't have any; and I know neither of us can get pregnant, so. Don't really have a reason to use one, do we?"