Yes, buttocks are generally considered a private body part. Multiple legal and medical sources define the buttocks as part of a person's private area.
Legal and Medical Definitions
Several legal definitions explicitly include the buttocks as a private area. For example, the Ohio Revised Code, Section 2907.01, defines "private area" as including "the genitals, pubic area, buttocks, or female breast below the top of the areola, where nude or covered by an undergarment." https://codes.ohio.gov/ohio-revised-code/section-2907.01 Similarly, another source states that "The term ‘private area’ means the naked or underwear-clad genitalia, anus, buttocks, or female areola or nipple."
Medical contexts also treat the buttocks as a sensitive and private area. For instance, conditions affecting the buttocks, such as diaper rash, are discussed in medical literature as impacting a private area. https://www.mayoclinic.org/diseases-conditions/diaper-rash/symptoms-causes/syc-20371636 Skin problems related to incontinence are also specifically mentioned in relation to the buttocks. https://medlineplus.gov/ency/article/003976.htm
Social and Cultural Perspectives
While legally and medically defined as private, societal views on the appropriateness of exposing buttocks vary. Cultural norms and contexts influence how individuals perceive and react to the exposure of this body part. For instance, the level of exposure deemed acceptable in swimwear differs significantly across cultures. A Reddit discussion highlighted this variance in perceptions, with some considering their buttocks private and others not. https://www.reddit.com/r/NoStupidQuestions/comments/ec5vhg/would_you_consider_your_butt_cheeks_to_be_a_part/
It is important to respect individual boundaries and cultural sensitivities regarding the exposure of buttocks.
Conclusion
The buttocks are considered a private body part due to legal definitions and medical contexts. However, social perceptions vary depending on cultural norms and individual preferences.
