Peter moved directly from an amazingly courageous role to Disney, becoming an Adventure Boy with the two usual attributes: a muscular physique and heterosexual obsession.
In 1966, he played the titular role in The Fighting Prince of Donegal: Red Hugh, the 16th century Irish prince who started a rebellion against the oppressive English. Hugh falls for a girl (Susan Hampshire), but also buddy-bonds with an older man.
Maybe the parallels with Victim were too great, or maybe Disney was being extra-cautious after the accidental outing of Tommy Kirk. For whatever reason, Peter never worked for Disney again. Instead, he continued his career of gay-vague and not-so-gay vague characters.
I have not been able to discover his real-life sexual identity, only that he was married to Julie Peasgood for a time, and has a daughter. But with all of his gay-vague and gay roles, who cares?
See also: Fighting Prince of Donegal.