that is not cum, that is a vaginal fluid that flushes out the vagina and is a natural way of keeping the vagina clean.
The one above is talking about vaginal discharge but if you are talking about squirting, women simply do it because sometimes it just happens when you stimulate the G-spot. No other reason. The liquid is not semen, it's clear and watery.
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My suggestion is to do your homework on the female body (even though you "think" you might already know it) as I find the female orgasm to be the most incredible thing I've ever experienced. Having a phenomenal sex life, and a multi-orgasmic girlfriend, she was never able to have a squirting orgasm. UNTIL I learned a few things that blew me away.
Vaginal discharge serves several functions.
Most females are capable of squirting but they do not all do it every time they ejaculate.