Once again, as usual you're WRONG! Has not a thing to do with rights, it has to do with Informed consent. While children may be able to give consent, a more complex question applies in terms of informed consent: whether children are developmentally and otherwise able to give informed consent, in particular to an adult, bearing in mind power relationships, maturity, experience and mental development. For this and other reasons most states have an age of consent under which a child is deemed unable to give consent. As evaluation of maturity, mental maturity, child development, child communication, and child intelligence are further explored, this may be based on psychological and medical evaluation of status for sexual activity instead of chronological age.
No! It's the same as above! It's called "Informed Consent" For example, people who perform sexual acts on sleeping people are not given consent unless the initiator have given prior informed consent to the act within a reasonable recency, and are assumed to be consenting during the act and to not prosecute for it when waking up. This is also an issue in rape fantasy enaction.