Kyoushirou to Towa no Sora

Anime where the male lead (or major supporting actor) wears glasses

A list of anime containing ecchi elements, but are not tagged as ecchi by MAL. While the ecchi content may not be as prevalent or extreme as officially-tagged ecchi titles, there is still enough to be of interest to fans of the ecchi genre. Many of these register at least 1.5/3 stars on AniDB's "tag-weighting" system for ecchi.
Conversely, those who don't care for ecchi may wish to use this stack for cautionary purposes, as these titles may contain things like pantyshots, revealing outfits, incestuous overtones, oversized/jiggling breasts, swimsuit/lingerie moments, extended bath/shower scenes, lewd dream/fantasy sequences, innuendo, or general fanservice in an otherwise serious/"respectable" show.
Only the first seasons of franchises are listed. Some titles may (eventually) have additional details explaining why I've placed them on the list.

Part 1: https://myanimelist.net/stacks/24838
Part 3: https://myanimelist.net/stacks/26747

Anime series that covers all of its original source they're based on, with some notes.

Part 1: https://myanimelist.net/stacks/16812
Part 2: https://myanimelist.net/stacks/19939
Part 3: https://myanimelist.net/stacks/20122
Part 4: https://myanimelist.net/stacks/20258
Part 5: https://myanimelist.net/stacks/20709
Part 6: https://myanimelist.net/stacks/20940
Part 7: https://myanimelist.net/stacks/21451
Part 8: https://myanimelist.net/stacks/21523
Part 10: https://myanimelist.net/stacks/35847
Part 11: https://myanimelist.net/stacks/39870
Part 12: https://myanimelist.net/stacks/41719
Part 13: https://myanimelist.net/stacks/42460

Both the source material - manga - and the anime adaptation are done. If there is something to note, it will be written in the respective area.
"-" are informations
"+" are other adaptations such as sequels, etc.

If I am wrong about anything, please DM me, so I can correct it.