To avoid them in the future make sure make sure you go the bathroom and get your genitals clean and dry as soon as possible after sex - go pee (this prevents UTI's), wipe properly (between labia as well), spray or rinse your vulva with some diluted apple cider vinegar in cool water (I keep a spray bottle by the tub) and then either air dry or pat dry. I used to get them all the time, but since doing this I haven't had one. If that doesn't work you might want to consider taking acidophilus as a daily supplement and/or cutting back on sugars.