I suspect we will not agree, Luciemule, so I will step away from the thread after this post. I was not patronising you. Simply pointing out that the areas you found too graphic were actually scientific details. They are crucial to the conception of a baby.
FWIW, I am a Christian, have been since the age of 16 (not raised as an active Christian). My DH has been my only sexual partner in any way or shape. I believe the principles of sexual relationships being monogomous and life-long. Certainly not 'games'. However, I was brought up to have a healthy awareness of bodies, and not to think that they were secret, mystical, or to be ashamed of.
DD1 is 4.6, and has significant SN (she starts Special school in September). When I showed DH that video this afternoon, DD1 wanted to see it. She sat with me, and said "ahhh, Mummy, they're kissing, that's lovely ".
If my 4 year old with SNs can view that video, process what was relevant to her (a mummy & daddy kissing) and filter the rest, how on earth could a NT 8 year old not handle seeing it? Children who are hidden from the facts of life find them out in their own ways. When you present the facts to them, and openly allow them to explore them with you, the mystery goes, and they don't feel the need to 'find out'.