My mom and my friends know that I wear thongs. My mom is quite conservative, and she doesn't understand why people wear thongs. Every time she visits me, she brings a few boxers and leaves them at my place. My friends know because they have seen my thongs on the floor and on the drying rack. Underwear is never a conversation topic, so I've never had the chance to talk about my underwear/swimwear preference. I usually go to the beach alone, so my friends have never seen me in a thong.
Unfortunately, I have never been in a romantic relationship. I have had a few flings here and there, and all the girls that I've been with have said nice things about my thongs.