The Danish vhs version contains all the hardcore scenes. Most of them consist of pretty obvious body doubles for Cristina Lay and Gota Gobert but there's a scene of Ajita Wilson fingering herself that I'm sure was done by Ajita herself (hardly a surprise as she did do her fair share of hardcore porn) and the scene where Luciano is getting a blowjob by Guia Lauri Filzi, who was a busy hardcore diva during the early hardcore scene in Italy. I used to think that she scene with Luciano and Guia was shot specifically for the hardcore market since Guia doesn't appear in any of the other scenes. However, their scene also pops up in the atrocious-looking Hong Kong dvd release but minus the hardcore shots.
The only porno film I've seen Kieran Canter in is THE DEVIL IN MR. HOLMES (1986), which is one of the two porno films John Holmes made in Italy. Kieran plays the devil but doesn't actually appear in any sex scenes. It's a pretty interesting film, though, and it also stars Karin Schubert and Marina Frajese. The US dvd from Paradise Visuals is quite good-looking and well worth picking up.
Anyway, I know IMDb also lists Canter as being in Moana Pozzi's hardcore debut EROTIC FLASH (1981) and another porno called EROTICOBLUES (1981) but I haven't seen any of them. However, I've heard several times that he did porno so I've no reason to doubt it. There are lots and lots of legitimate actors in Italian films who ended up doing hardcore porn and I must say the topic fascinates me quite a bit. As for Kieran, he also appears to have done a lot of uncredited work. I found him in a small role in Sirpa Lane's final film THE SECRET NIGHTS OF LUCREZIA BORGIA (1982) for example, and I know he also did some acting under the name Mack Kiran. Rather mysterious bloke I say!