Sexual Pleasure Advice to Minors?!?

Why can't Glow age-gate threads based on user age? That's pretty basic functionality and it worries me that 15 year olds come here for advice on enhancing sexual pleasure versus general sexual health advice. 
It's illegal to host a forum for minors to talk about sex with adults, I thought. Even if it isn't, I don't want the option of stumbling onto those threads. 
Please advise.