From a user review in recapped:
"Bau does have a sex scene during the opening sequence (simulated), but that's basically all of the nudity during three hours. There may be a revealing upskirt shot of Herzi, but in the released version, it's fairly dark, and brief."
"The sex scene must be something like 2 minutes long. It's filmed in close shots, almost in a gonzo style, with a lot of groping and licking. It starts with doggy style, then it switches to other positions, while a third character peeps from the window. After the sex is over, various shots of Bau lying nude on the bed on her stomach, showing her ass, then she tries to take a shower, and it was the only full frontal shot of Bau, which is quite brief. She's fully shaven, which isn't consistent with the 1994 era.
Then, she has to dress quickly because somebody has rung the bell at the front door. A few more ass shots, then a few nip slips because her top isn't fully adjusted afterwards."
Credits to quecho.