Umm, there is not a set number of days to count down before sex will happen, all women are different. I personally would not have sex with someone until I am in love with him and know we are in a committed, long term relationship, and that generally means getting to know someone for quite a while first (and I would ask him to get tested for STD's first too, along with me). There are some women who will have sex on the first date, and some who will wait until the 20th date, or even longer, it just depends. Just because you are dating a woman, it in no way entitles you to sex, or means that sex will happen.
lead up to sex... 
