Even if religion wasn't a factor, the science of pair-bonding is valid, and also ties in to the biological theory of telegony
Telegony is the theory that DNA from sperm, even when the sperm cells are killed in the pathway to the uterus, are merged into the DNA of the woman's egg cells. So theoretically even if the woman was 100%proven faithful to her future husband, she could still produce offspring that looked like ex-boyfriends/hookups living or dead because those men's DNA would be embedded in enough fragments to change the DNA of her egg cells anyway
Combine that with ruined pair-bonding and realistically, as long as the woman didn't let cum go inside them, only 1 prior sexual encounter is acceptable for having a truly faithful partner you can truly share a life and have truly your own kids with.
And women can get easily fooled into thinking a random fuckboi actually cares about them. It's that emotional thinking rather than logical thinking that gets to them. As long as they learn the lesson once, Im ok with it
Microchimerism and telegony: the justification for one to afford to reject a woman with too much sexual mileage.
Remember those words, study them, so that later you won't be branded sexist when you reject a woman with a long history that you try to hide.