I don't entirely understand the stigma of an adult engaging in softcore activity with a physically developed minor. :v Hell, I don't really understand why adults and mature minors can't have sex. Should you two have a child or acquire an STD, you both willingly made the decision to risk that. The only issue I can fathom is consent and that doesn't seem to be a problem here.
EDIT: Although, expanding on that, I do see the potential for protection of the minor considering his/her underdeveloped frontal lobe, the part of the brain responsible for determining the severity of possible consequences. Incapable of comprehending the negative side-effects of their actions, teens may require a little extra help from the law.
I dunno. Personally, I'm pretty cynical. Fuck everyone. Should a couple be stupid enough to have unprotected sex and risk teen father/motherhood, they deserve whatever hell awaits them. Poor kid(s).