Very few were for abstinence sex education. I certainly am. Pro-lifers don't practice violence. We try to stop it. Earlier, it was intimated that sex education kills babies, too.
Sex education encourages the use of birth-control devices.
Birth control pills often work by preventing the embryos from implanting. Often birth control devices fail. The very high level of sexual activity caused by teaching promiscuity therefore causes additional pregnancies. Often, other alternatives are not even mentioned. But it also means preventing it from continuing i.e., it means abortion.