Monaural audio only, no binaural (don't count those with a mix of them)
Number of works: 15
For imersion/imagination, according to illustrations only. May not have any role (such as the famed under-mask blowjob)
Number of works: 3
Cumming from the Japanese term "ノーハンド"-(射精/オナニー/etc), wet orgasm one. Not exactly the same as "ruined orgasm". Don't ask me what's the difference from the English term "hands-free orgasm" (HFO). Majority is related to nipple play only stimulation or otherwise mesu-iki, so look through it to filter out those.
Number of works: 108
Livestreaming character setting (not exactly "meta"?), may not be in livestream-like broadcast format.
Number of works: 41
By Twitter dm, on Ci-in (usually premium reward content), etc. Remove from pool when released on Dlsite.
Number of works: 48
-- Underwater, more than "water sounds". -- Are bubbles "water sound"? Overlaps with underwater bubbles, except foam. -- Sadly not all slime works "eat" you.
Number of works: 30