Admittedly I know little about how puberty works with girls. But isn't having explain what wetness between a woman's legs means, to highschool girl, roughly the same as having to explain what an erection means to highschool boy. Because I'm pretty sure, that higschool boys would be well acquainted with erections, even if they were somehow so naive they didn't know what they were for.
Sometimes for women getting wet is something like morning wood, or not related to arousal. It could happen as discharge, ovulation process, or just because you're super hydrated on a specific day. In that context though of making out it really does apply to the, but alas they are useless lesbians