Quote:
You can talk about it whenever you want, it just depends on the dynamic you have setup and the type of girl she is. Plenty of the women on online dating services are also on there because they just want to fuck and nothing more.
with the difference that they are not there just to fuck anybody because, they can fuck anybody... They are specifically looking for a guy with certain characteristics and once they find him, they'll let him know.
And in case they are just looking to fuck any guy, no matter how ugly they are they can easily post their profiles in an escort website and earn some good money while fucking any guy.
Having said that as far as I know there is no scientific study stating that we should not talk about sex to girls before meeting them in real life. It is up to you to talk about whatever you want and she to reply to whatever you talk about.