I know you won't like this, but there you go..
just nothing but the harsh truth.
And to your question, I don't care.. haha
Seriously, if a girl fuck on the first date or on the 10 date, I think it's none of my business and so in that sense I also don't judge girls who sleep around.
But usually I would say 2nd or 3th date
Thank you for the feedback :)