I love wearing underwear sometimes..other times I like going without. It just depends on what I am wearing, the situation, how I am feeling, etc. Not sure why anyone would think its gross. Not like I am showing off to anyone. Panties are ok, not bad like bras. I HATE bras. I wish we could get rid of the dang evil things.
I always wear underwear if I am going out anywhere in public. I couldn't imagine not wearing underwear if I was wearing a dress or skirt, and it is super uncomfortable if I don't have them on while wearing jeans. I like thongs, and that is what I wear 99%, they are comfortable and never show lines. A lot of the time I won't wear them with my pjs or boxers at night, though, cause I don't really see the point.