Women who use online personals services are more apt to give in to sex on the first date according to a few studies done regarding the services and singles that use them. Many women feel they know men that they meet online. After all, they've already chatted online and even ask the tough, personal questions about sexual history before meeting. This shared information and closeness that is felt can often lead to women throwing caution to the wind on a first date without even realizing they are doing it.