Not a universal rule of thumb but I find most women will internally decide if they will sleep with a man on a first date or within a few shorter interactions. Once they have decided, its just a few factors like alcohol, follow-through, and mood that day whether it happens on a first date.
And also not universal, but a man will often need to decide if he wants a fun time or something really serious. Many women will file you away as a fling or one night stand if they sleep with you on the first date especially if internally she is “not a girl who does that.”
If you’re really interested, a good path is to make clear you really want to and make sure it happens on like date 3 or 4. But you can absolutely close your own window if you wait to long and make her think you’re not really into her.
YMMV if like you and me, you are innately charming, worldly, and debonair and can make it happen whenever and wherever on your own terms. Advice above is for the regular guys.