A Northchurch man was jailed on Friday for nine months after pleading guilty to sexual activity with a teenage girl.
At Aylesbury Crown Court Daniel Skinner, 34, of Valley Road, admitted three charges relating to a 17-year-old.
The offences occurred in September and October last year.
He is a former Berkhamsted School student and resigned from his post as sports secretary on The Old Berkhamstedians committee in January.