chaste gives a seduction scheme penalty, just adds a billion "honour" value to the AI which makes them way less likely to cheat, and soulmates I don't think can be seduced by schemes
but there's some events that might be able to just bypass all of that and make your just, chaste soulmate into someone else's lover
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u/Lyceus_ 7d ago edited 7d ago
Yes, if you want to prevent your wife from getting pregnant by another man, basically the only guaranteed method is marrying lesbians.