all depends from your friends and if they are true friends.....for me wasnt never a problem...my friends know about my preference and not only i never had bad reactions , but sometimes i had funny moments....for example, some years ago i went to Cyrpus for a few days and i stayed in my friend place.he knows.so during the first night, we said goodnight and we made our way to our bedrooms....it was just then, when my friend in a joke mood, asked me if i wore a thong..i asked yes - it was a black one from homme- so he said, strip to your thong and model it for me..i did , we laughed and thats it...
one another time , i was with another male friend and as i stepped out of my car, while he was in , i had a huge maletail..he said " are you wearing a thong again...omg.. and laughed...i answered " always" and closed my eye...
this summer with another couple, friends of us, we went to the beach...to be honest the meeting was accidental....in Athens there is one private beach the astir beach, which we both like a lot..
https://www.google.com/search?q=%CE%B1%CF%83%CF%84%CE%B5%CF%81%CE%B1%CF%83+%CF%80%CE%B1%CF%81%CE%B1%CE%BB%CE%B9%CE%B1&rlz=1C1GGRV_enGR754GR754&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiwz9fI3OvfAhXEwosKHXWkCbIQ_AUIDigB&biw=1366&bih=667#imgrc=n8QvKFoPAsXpJM:
https://www.google.com/search?q=%CE%B1%CF%83%CF%84%CE%B5%CF%81%CE%B1%CF%83+%CF%80%CE%B1%CF%81%CE%B1%CE%BB%CE%B9%CE%B1&rlz=1C1GGRV_enGR754GR754&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiwz9fI3OvfAhXEwosKHXWkCbIQ_AUIDigB&biw=1366&bih=667#imgrc=xKzLJq7-XkH-NM:
https://www.astir.gr/beach/so one sunday we decided to enjoy the sea, we left our kids at home, and of we go !! both in thongs as usual...so as we were on the way to the beach, my wife's mobile rang..it was her friend asking where are we and what are we planned for the day...my wife said that we are on the way to astir beach and to her suprise her friend said " what a great idea, we are stuck because of trafic and we have no hope to approach the beach we planned to go, but astir is very close to us, so we are going to join you"....there was no way back and there was no way to deny...i was a little embarrasent at the moment, but we didnt have other choice.....
so what exactly happenend if you want i can tell but they saw us in our thongs, they didnt say much, we had a great time..
so dont have any hesitation, enjoy your thonging and feel free about it...good friends likes you as a person not because of your underwear or swimwear choice...