Although in past times (pre 60s), excepting cases of wartime, it would probably have been harder to cheat and get away with without serious consequence. As par

Although in past times (pre 60s), excepting cases of wartime, it would probably have been harder to cheat and get away with without serious consequence. As parental testing gets easier/more affordable (perhaps even mandatory at birth or at least for child maintenance collection) this may change. As it stands, culture encourages promiscuity under the guide of empowerment (whether this is positive or negative is a longer argument) and legislation certainly doesn't discourage cheating (e.g. fault-free divorce, child maintenance to support the female partner even in cases where the male partner ends up not being the actual father, alimony in the U.S.).