Quote:
if a girl does not want to have sex after 3 dates she isn't attracted
This is completely not true. I've now spoken to 3 separate women over the course of the last month who told me that, some on more than one occasion, they made a guy wait THREE MONTHS before having sex with him, despite being very much attracted to him. In all of those cases, they went on to have relationships that lasted over a year or more with him. I should point out, in all cases these are attractive, high-self esteem women with plenty of options and high-value, attractive men with plenty of sexual experience under their belt.
If a woman really values you as a potential long-term boyfriend, she will often want to hold back from having sex, not only on the first date, but for a certain period of time, to gauge exactly how invested you are in her, whether you're willing to wait, be patient, and show her you care about her.
If you do sleep with a girl on the first date, or that night, although you may have won the battle, you may unwittingly have put yourself in the category of men who she'll fuck once but be unlikely to see again. If that's what you're looking for, then great, but if you want an LTR or MLTRs, then pushing for sex on the first date is not the way to go, in my opinion.
As for David X, I've learned a lot from him and I think his core, fundamental principles about being honest and straightforward are incredibly useful - he definitely helps guys become more authentic in their interactions with women, which ends up being much more useful in the long term than most routines or tricks. His personal rule of 3 dates is his - you can still live by his essential principles and choose 5 dates, or not have any specific number in mind. The core principles - Honesty, Trust and Respect, and the two rules: (1) You're the most important person in the relationship and (2) Don't worry about what she's thinking, can still apply, and are useful for most guys in becoming more dominant, confident, and authentic.