Dershowitz had a reasonable point in his essay about age of consent, and that is that America's many state laws are insane. Prison and sex offender registry for life in one state, but the same exact activity may be perfectly legal the next state over. Every state has a different age of consent, different near-age exceptions (or not), different penalties, and so on. It's no wonder so many teens get in trouble with the law. The feds have their own rules: Sex with any sixteen year old is okay, even if you are a sex tourist. Under 16, they prosecute. Makes more sense for every state to adopt the same ages, exception, and penalties.
And for God's Sake, stop putting kids on the sex offender registry for posting or sending nude photos of themselves. It may be very very stupid, but the legal response is much more harmful than the act.