From a female perspective, I frequently am horny and have a wet crotch many days. But also when I’ve had a bit of group sex and then have to leave without a good place to cleanup…yeah then lots of cum running down my leg. Was a bit embarrassing on the train a couple times that I can remember.
If I have to wear clothes, I don't wear underwear. So, if I cum I just have to hope what I am wearing will not show too much.