quoting post from RedChecker:
The way I look at it, it's mostly to do with the contractual arrangement (of sorts) between the model and photographer.
Having a male model for the shoot effectively introduces a middle-man so to speak and this effectively distances the photographer from any accusations of wrong-doing or the potential for 'favours' to be given/taken. I would personally like to think of the ethics of the porn industry (at least at the higher-end corporate level) in a similar way to the medical profession in which the involvement of people involved is kept to a bare minium (eg. doctors not permitted to have relationships with patients).
I would imagine the 'gonzo' work is generally reserved for one-man porn outfits as I would imagine at the corporate level there's too much money at stake to be involved with any potential accusations of wrong-doing. I understand several of the larger companies do strictly enforce a no-fraternizing policy regarding models & staff.
What about this guy...
Wikipedia seems to have a list of gonzo producers/actors who seem quite well-known professionals (cant really bring any personal research to this table i'm afraid, unless reading the old porn reviews in bizarre counts and lets face it, most of those weren't about porn).