Single mothers educate their children about sex, so children don't have to avoid it. They can teach by examples and face to face. After all, you are an experienced person and should have rich experience in sexual knowledge. The key is to educate children, not to indulge in sex and affect their studies, and not to affect their health because of sexual immorality. As the saying goes, only dead cows, no plowed fields. Some contents are sensitive, and we can also communicate privately.