Some principles and things to note:

1. Adults’ expression to one another must not be restrained to only what is suitable for children.
2. Sexuality is a normal thing that most people are interested in. It is not inherently illegitimate, deviant, or corrupting.
3. Children and adolescents who are kept in ignorance and fear of sexuality are especially vulnerable to sexual abuse by adults.
4. Anonymous and pseudonymous speech are necessary to the freedom of a free society.
5. The chief threat of sexual abuse to children does not come from anonymous or pseudonymous speakers on the Internet, but from family members and acquaintances — especially those with authority over the child. As such, if the question is “Who should be subject to greater scrutiny, to prevent child sexual abuse?” the answer will be “parents, guardians, teachers, youth pastors, etc.” at a much higher priority than “anonymous and pseudonymous Internet users”.
6. Identification requirements for speakers or audiences are a necessary step to violent and unlawful censorship, and are not necessary for legitimate purposes.

Given these principles and observations, I conclude that the expected effect of such regulations would be to increase sexual abuse of children, while also strongly harming the ability of a free society to discuss and educate about sexuality.