So, I'm generally not a smelly person. But recently I've found that when i move after sitting in the same position for a period of time, I can smell a sour smell, like food gone off, but it's just there for a few seconds and quickly disappates. More precisely, it happens when I sit with my legs together, or crossed - as soon I spread my legs apart, the smell comes. But no one around me has complained about smell or anything, nor does this happen when I am in shorts. I used to just think it was related to my period, but it's definitely not limited to those days now.