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 1964, he starred in The Moon-Spinners as Mark Camford, a young banker who gets involved with spies in Crete, and in the process falls for vacationing British girl Nikki (regular Disney star Hayley Mills). No buddy-bonding, but quite a lot of shirtless scenes, and more suspense than one usually gets from Disney.
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.
In I Killed Rasputin (1967), Peter played Prince Felix Yusopov, who was bisexual in real life, the lover of Grand Prince Dmitri Pavlovich (and enjoyed dressing in drag). The movie tries to closet him, and all but eliminates Dmitri, but still Peter manages to imbue his character with a homoerotic passion (and he dances with a man).
I haven't seen any of Peter's later works, mostly British television and tv movies, but some of them look interesting, and with ample buddy-bonding potential: The Cat and the Canary (which has a "gay" keyword on the Internet Movie Database); a version of Shakespeare's Midsummer Night's Dream; and Clayhanger, from a series of novels by reputedly gay author Arnold Bennett.
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.