Thanks for the input.
I still think I will do it though. I should have been more specific, by ladyfriend I meant my live in partner. She knows I have a foreskin fetish, she has stumbled across some tumblr sites in my browser history. She is also occasionally willing to engage in some foreskin play.
The reason the video excites me is that when I try to explain to her that the frenulum or ridged band are the most sensitive parts she takes it as a criticism of her skills in the bedroom. I'm hopeful that the video makes the information impersonal. There is a similar video on the clit, I'll suggest we watch them both.