Extremely explicit sex education materials for children in UK

This report from LifeSiteNews.com (and the report it refers to) is troubling, to say the least. Proposed legislation is currently being debated in the Philippines where some form of sex education is mandated from Grade 5 and up. The bill does not mention parental input and opt-out rights, but it does mention government agencies who will design such a curriculum. What would happen if those agencies just happened to share the same twisted mindset as those who develop such inappropriate materials in the UK? The bill is at best silent on the matter, and leaves the possibility of abuse -- teaching children what parents do not consider appropriate for their children at that age. Parents should rise up and take their responsibilities seriously -- before someone else does so in their stead.