The most he could be charged with is statutory rape, as the girl is over 14 (sex with anyone under that age automatically gets 'paedophile' status, but it is acknowledged that people over that age do engage in sexual relationships). Obviously if the sex is within the bounds of a relationship is is more acceptable. Given that there is only a 2 year age difference I doubt the police would be too interested, but people in that situation still need to be discreet because technically it is a crime. Theoretically if he was tried and prosecuted by a zealot then he could be made to sign the sex offenders' register for life - not something you want on your c.v.