Maybe it's not politically feasible, but most kids will need sexual knowledge more than Shakespearean verse to be functioning adults. Here's a sample curriculum.
Researchers of fraternal birth order effect argue that sexual orientation correlates with an individual’s number of older brothers. Could this help to explain the homophobia of some traditional religious societies?
Or, more specifically, what's wrong with taking a steroid, while you're pregnant, to try to increase the odds that your female fetus will someday grow up to be a straight woman who gives you grandchildren, and not a lesbian daughter more interested in puppies?