I am straight and pretty much only wear thongs. The support is incredible and you can't even tell you're wearing anything at all. People talk about not wanting the string there, but you don't pull them all the way up into your crack such that they give you a wedgie. The JM Skinz is the best I've found. Holds my 7.5" firmly in place and I can't even tell that I'm wearing anything. The one problem with some thongs I've found is that, at least in size small, they tend not to completely cover my cock, but JM Skinz and N2N's do a great job at each. JM SKinz is the more manly of the two though.
Furthermore, I do everything in mine- I sleep in them, I play sports in them, run in them and wear them to work. I used to be embarrassed about them, but now I'm not at all because they feel so natural I couldn't imagine not wearing a thong...plus the bulge is great- the only time I go commando is when I wear skinny jeans because I like the look of the outline of my cock in them...