Is there any reason for a professional in the education and health field to introduce to young people ideas of waiting for or delay of sex?
For many young people of faith the main reason for choosing to wait until they are married is the values taught by their faith. This is not because their faith believes sex is bad. It is rather that they so affirm the place of sex within the security of marriage that they reject it anywhere else. 
Secondly, the knowledge available to us as professionals about the risks involved in early sex and promiscuous sex, while not being the focus of our work, should be in the background. STIs are steadily increasing among 16-24 year olds , Pregnancy and Abortion figures  for under 20’s remain high, if dropping. The mix of alcohol abuse and early sex is known to be common.  Abusive and violent relationships . So, although “.., focusing on scare stories and the negative aspects of sex is a real turn-off, and doesn’t equip young people with either the skills or the knowledge to negotiate relationships in the real world.”
There is good reason to help young people find healthier, safer, wiser ways of relating. One good way is to use the resources within their own faith and faith communities to help them do this.
 Clinton. C (2011) Bad or in the Right Place? [Article]
 Five Years of Abstinence-Only-Until-Marriage Education: Assessing the Impact - Debra Hauser. available at http://www.advocatesforyouth.org/publications/623?task=view
 Jo Adams Associates: Apple Loft
 (over 40,000 a year in 2008) http://www.dh.gov.uk/en/Publicationsandstatistics/Publications/PublicationsStatistics/DH_099285
 Alcohol and teenage sexual activity NSPCC 2006 found at https://www.nspcc.org.uk/preventing-abuse/keeping-children-safe/healthy-sexual-behaviour-children-young-people/
 Partner exploitation and violence in teenage intimate relationships. Barter, McCarry, Berridge and Evans Bristol University / NSPCC 2009
 Are you ready? Young people’s views of sex and relationships. FPA. London . 2007 http://www.fpa.org.uk/sites/default/files/are-you-ready-young-peoples-views-sex-relationships.pdf