My son is wearing a thong and he is in high school

If he bought them himself. I would except it. If I buy his underwear. I am not buying them.

what is the problem exactly- does it matter if he is gay? Maybe his girlfriend likes them or they are cool to him

I would ask him about them. Just casually - "so is this the type of underwear you prefer now?" but I wouldn't make a big deal out of it. I don't think it's any indication of his sexual preference though.

Who knows what the "cool" thing is anymore. I'm 24, I wouldn't consider a guy wearing a thong cool, but maybe kids are doing it these days. I wouldn't worry or stress too much. Just bring it up casually and say no biggy but jw if that's the type of underwear you are wearing now, and maybe sneak in a why..He might get mad or offended, but heck you are his mother that's what mom's do is get our nerves once in awhile :) I wouldn't jump to gay conclusions, but if that is the case, he will tell you when he is ready. I wouldn't ask him, I'd let me come to you on his own about that part of it. Good luck.

Why does he need to "confront" you about what underwear he has on?? He's in HS... He is going to have his own preferences... he has to get out from under your apron strings at some point!! I think the bigger question is why do you feel this needs to be a confrontation?? That worries me. 

what do you mean he doesn't know how to wash them??? He would was them the same way he would was any other underwear, what's to know???

And why is this sooo important that you have to post it 3 bloody times over. are you a homophobe? it's not catchy ya know?

I think your reading WAY to much into this.
Some men (and teen boys) just find them more comfortable. Nothing more, nothing less.
If your worried about it just bring it up casually when you do the laundry.

I have to agree with Ambie0526 as well. Don't ask about the gay thing.
I doubt underwear has anything to do with sexual preference but his preference is he will come to you in his own time when hes ready.

I don't get what you mean he doesn't know how to wash them? I just put my thongs in the wash like any other underwear, and that works for me.

I also agree with the other ladies that you are reading WAY too much into this. Maybe he bought them as a joke or something, and even if not it doesn't mean that he is gay. I had a friend in HS that wore them occasionally just because he thought it was funny. He even pulled his pants down during drama once (he had a line that was a joke about spanking). That was just his personality, but he was not gay.

I also don't see what the problem is if he is not gay. I don't think there is any reason to confront him. The only time I was confronted about wearing thongs was my dad telling me he was going to throw them away if he saw them because I was his "baby girl".