Women only date multiple men or have backup options if the top guy isn’t her first choice interest.
More dating interactions are started from tech methods than real life methods now.
Tech methods are excellent at enabling women to date multiple men. Prior to the rise of tech methods, it was far more difficult for women to date multiple men. The Gen X women who were in their 20s and early 30s in the 1990s/early 2000s could only date multiple men if they had a good daily routine and were regularly going out to bars and events and were going to singles dense gyms in a larger city.
It's far easier now for women to put multiple men in her rotation from swipe apps and social media DMs. The abundance that women have had in recent times would have been difficult for a young woman in the 1990s-early 2000s to imagine.
Tech methods are excellent for men in producing "one date, no sex, no second date" interactions. Some of those interactions are a fault of the man. The man isn't screening well enough and arranging dates that he shouldn't arranging out of scarcity mentality from not getting enough matches while the woman is flooded with matches.
Once she finds a guy with potential, she drops the other guys like that.
This might cause some guys to get dropped after 1-2 sexless dates, but I'm not sure if it is the primary reason for that event.
If you find a woman is still talking to other guys after a month of talking then you aren’t her first choice.
This is accurate. After a month, a man should have gotten 3-5 dates and gotten sex by then. If he hasn't gotten to sex by then, that man isn't her first choice and it is possible the woman is dissatisfied with all her choices.
If the man has gotten to sex and the woman is still entertaining options with different men, it could be interpreted that the sex wasn't satisfying enough for her to lock in with that man.