Omutsu (Diapers) Īnother variation of omorashi play is omutsu play (おむつプレイ). Other yagai hōnyō practitioners operate much like graffiti artists, attempting public urination acts without being caught.

One of the variations is known as omorashi yagai, which translates as 'to wet oneself outdoors (or publicly).' A further variation includes yagai hōnyō, or 'outdoor (or public) urination', in which the subject publicly removes their clothes to urinate. There are various ways in which omorashi is practiced, giving rise to a number of sub-genres. In the English-speaking BDSM community, the term 'bathroom use control' is used to describe a specific form of omorashi play in which the dominant controls how, when and whether the submissive is allowed to use the bathroom. The word is also occasionally romanized as 'omorasi' in the Kunrei-shiki romanization system. Paul Fedoroff acknowledges this distinction, observing that 'the theme of taking control of autonomic process is prominent in the paraphilia known as omorashi, which involves sexual arousal associated with the sensation of needing to urinate due to a full bladder.' Westerners who make the distinction sometimes use the term 'bladder desperation' or 'pee desperation' to do so, though increasingly fetish communities in the West have taken to adopt the Japanese-language terminology. The Handbook of Clinical Sexuality for Mental Health Professionals specifically defines omorashi as the persistent sexual arousal toward a full bladder.

In recent times, however, the Japanese-language loan-word 'omorashi' (or 'omo' for short) has grown popular and well-understood by fetish communities worldwide. Outside of Japan, 'omorashi' has not always been clearly distinguished from the broader categories of urolagnia or 'water sports', of which omorashi can be considered a specific form or sub-genre. Sub-genres of omorashi include 'omorashi yagai' (public urinary desperation or wetting), ' omutsu omorashi' (wetting oneself in a diaper), bedwetting, as well as a wide variety of cross-over with other garment fetishes. While urinary desperation and 'wetting' fetishes are not inherently or exclusively Japanese, the clear distinction and definition of 'omorashi' as a specific sub-genre of urolagnia media has turned it into a loan-word amongst fetish communities worldwide. Omorashi ( Japanese: おもらし / オモラシ / お漏らし, 'to wet oneself'), sometimes abbreviated as simply 'omo', is a form of fetish subculture first catagorized and predominately recognized in Japan, in which participants experience arousal from the idea or feeling of having a full bladder and potentially wetting themselves, or from witnessing another person in that situation.

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