smell

hey ladies i know this may be weird but yea. i noticed i don't have an odor normally, but when i'm touched "down there" i have an odor.  sometimes it's bad and sometimes it's normal i guess you can say? why is that so and how can i keep it to just being normal, i heard there's food to eat to keep it normal and foods to avoid. and no i don't have an infection of any kind thanks !