I'm a big fan of Red Pill. However sometimes I see writers make mention of female cuckolding strategy. Most men do not face a significant risk of this type of paternity fraud. Research strongly indicates that cuckolding is rare.

Further reading:

The fatherhood myth

"The best British study, published in 1991, suggests a non-paternity rate of about 1 per cent. A 1992 French study indicates a rate of 2.8 per cent. A 1994 Swiss study has a maximum rate of 0.78 per cent. A 1999 Mexican study comes in at 11.8 per cent. And the best North American study, published in 2009, proposes a rate between 1 and 3 per cent. There are no published Australian studies."

By-blows, paternal age, and all that.

Here are some good numbers from recent studies:
Contemporary Germany: 1% From checking for HLA type in medical cases.
contemporary Switzerland: 0.83%
Contemporary Iceland 1.49% (from DeCode)
Contemporary Dogon, in Mali. Mildly polygynous. : 1.8%
Contemporary Bushmen (< 2%) (Original source was intoxicated, as usual. Intermediate source was intoxicated and crazy. )
Patronymics & genealogical studies (gives info over the past few hundred years)
Afrikaner: 0.73%
Ireland ~1.6%
England ~1.3%

The paternity myth: the rarity of cuckoldry

What are the real numbers? Zuck asserts that they’re more in the 1-5% range, with 3.7% being a high-bound figure for one study. This varies by culture and socioeconomic group, and the segment of the population being surveyed.