Sentence:  “A thong,” she answered him breathlessly. Now completely turned on by the fact that his man was sniffing her <WSD>underwear</WSD> and grinning like a tiger that took down its prey. That is if tigers could smile and still look sexy. 
Meaning of the word marked with <WSD> tags:  Underpants (boxers, briefs, panties, etc) and bras.