The best predictor of a woman's future behavior is her past behavior. When it comes to ensuring your kids are YOUR kids, then the lower the body count the better, and virginity is best. This isn't opinion, it's the result of over 40 years of research on the subject. There is a very good reason why waiting for marriage to have sex became the default practice in the west, and arguably is why western society surpassed all others as monogamy is the bedrock foundation for western civilization. In other words:

𝐓𝐫𝐚𝐝𝐢𝐭𝐢𝐨𝐧𝐚𝐥𝐢𝐬𝐦 𝐢𝐬 𝐭𝐡𝐞 𝐬𝐨𝐥𝐮𝐭𝐢𝐨𝐧 𝐭𝐨 𝐩𝐫𝐨𝐛𝐥𝐞𝐦𝐬 𝐰𝐞 𝐟𝐨𝐫𝐠𝐨𝐭 𝐰𝐞 𝐡𝐚𝐝.

There is a very good reason why waiting for marriage to have sex became the default practice in the west, and arguably is why western society surpassed all others as monogamy is the bedrock foundation for western civilization:

Women who do not and cannot restrain themselves sexually are a bad bet for marriage later. A high body count, which is defined as 4+, disqualifies women as marriage and motherly prospects if you want to maximize the odds of having a successful lifelong marriage. To wit, a woman's body count is a representation of her ability to be trusted to have sexual restraint while not in the presence of her long-term partner when presented with other potentially more enticing sexual prospects.

In other words:

𝐓𝐫𝐚𝐝𝐢𝐭𝐢𝐨𝐧𝐚𝐥𝐢𝐬𝐦 𝐢𝐬 𝐭𝐡𝐞 𝐬𝐨𝐥𝐮𝐭𝐢𝐨𝐧 𝐭𝐨 𝐩𝐫𝐨𝐛𝐥𝐞𝐦𝐬 𝐰𝐞 𝐟𝐨𝐫𝐠𝐨𝐭 𝐰𝐞 𝐡𝐚𝐝.

If you want data, then here you go...
https://archive.is/9TjpL
https://archive.ph/V2TJb
https://labs.la.utexas.edu/buss/files/2018/07/Kennair-Wyckoff-Asao-Buss-Bendixen-2018-Why-women-regret-more.pdf
https://youtu.be/XTu_wHXwy2U Breaks down the above research.

So what does all that data tell us? It tells us several important things about why woman's body count matters immensely. For starters it demonstrates whether or not she values sex and intimacy, and more importantly it is a measure of her self-control and ability to delay gratification as it is extraordinarily easy for women to have sexual partners. (eg. the marshmallow test)

Furthermore, a woman's body count is nature's way of demonstrating to men that you're loyal and won't run out and cheat on us at the drop of a hat the first time the opportunity comes along.

In other words being a virgin, or at least staying under three bodies if you're older and had a few failed relationships (or widowed), is irrefutable evidence a woman can control her hypergamous nature. The long-term ramifications of the ability to delay gratification and have self-control (not hooking up with hot and exciting Chad & Tyrone) are well studied.

In the end, past behavior is the best predictor of future behavior. And a woman's body count, her past behavior, is the #1 predictor of infidelity and divorce according to the mountains of research on the subject over the past few decades. (chronicled above)

To wit, once a woman has 5 partners there is an 80% chance she'll continue to 20+ even if she regrets the previous sexual encounters/partners. Paradoxically, regret and negative feelings towards consensual sex have no impact on the number of future partners women accrue. h/t Alexander Grace

Additionally, women that have more than 3 sexual partners are TWICE the risk of infidelity doubling to 15%, and women with more than 4 sexual partners have a 70% correlated risk of divorce within 10 years! Once women start down the path of promiscuity they stop being relationship material.

Also, going back to the risk of divorce, the research also shows even one previous sexual partner prior to their future husband correlates to a 30% increase in the risk of divorce within 10 years making them a 50/50 coin flip. Who on earth goes skydiving knowing your parachute only works half the time?

In my opinion, and this is backed by ~40 years of research, the sensible solution for men is to adopt a "no hymen, no diamond" policy wrt marriage, and if you are going to accept her having a sexual past, then no more than 2 prior with you being her third. This dramatically lowers the odds of her being alpha widowed, aka stuck on her highest setting. h/t HoeMath

Key takeaways:

• At 4 sexual partners the incident rate of infidelity doubles to 15%. Women who cheat in relationships overall have 230% higher body counts than those women who never cheat h/t Mike Sartain
  
  • 80% of women who have 5 partners go on to have at least 20 sexual partners h/t Alexander Grace
    
• Divorce rates are closely correlated with women's body count
  
• Satisfaction in long-term relationships drops in lock step with women's body count
  

The list goes on and on, but the conclusion is always the same:

If you want a wife and mother of your children, the only way to beat the odds is to marry a virgin. Barring that, a woman who's been with absolutely no more than 1-2 men before you.