I should avoid including films that aren't rated Category 3. For example, "Blue Lagoon" is a 1980 film but not Hong Kong, so that's not relevant here. Another example, "The Romance" (1989) by Tsui Hark is a well-known erotic film.

Another film to consider is "Dragon Inn" (1992), directed by Tsui Hark and starring Wong Kar-wai's frequent collaborator, Maggie Cheung. However, I'm not sure if this one is Category 3. I might have to look more into that.

It's important to note that some films might be categorized as Category 3 in Hong Kong but might have different ratings elsewhere. I need to focus on the Hong Kong rating. Also, since these films are for adult audiences only, the list should emphasize that they are for educational purposes and that viewing them is restricted unless the viewer is over 18.

First, I'll need to verify the ratings of these films. Some movies might be more well-known outside Hong Kong, so confirming their Category 3 status is important. For example, "The Story of a Woman" (1990) is a Hong Kong film that's often mentioned in discussions about eroticism. Then there's "Red of China" (2004), which is known for being a very explicit film.

I should also include films like "The Confession" (2003) by Wong Kar-wai, though I'm not certain about its rating. Another possibility is "Love on the Road" (1993), which is a Hong Kong erotic drama.

I also need to make sure that the list is accurate and respectful, avoiding any explicit content descriptions beyond what's necessary to explain the rating. The final list should be concise, with 10-15 films, perhaps divided into eras (e.g., 1990s, 2000s) or by director. Including a note that this is for educational purposes and advising compliance with local laws and age restrictions is essential.

I need to ensure that each film mentioned is actually rated Category 3 by the Hong Kong authorities. Since I can't check current databases, I'll have to rely on reputable sources and common knowledge. Also, noting that some films transitioned from Category 3 to other ratings might be relevant.

Also, female-led films directed by women, such as Sylvia Chang's works, like "The Romance of Book and Sweets" (1992), which is known for its eroticism. But again, I need to verify the rating.