This article analyses the definitional reforms and re-categorisation of sexual offences under the Thai Penal Code in the period of 13 years, namely, the 2007 and 2019 amendments. The incidents are of uniqueness as the 2007 amendment shared much resemblance with jurisdictions that have departed the original meaning of rape and attempted to re-conceptualise sexual offences, whereas the 2019 amendment shared much similarities with jurisdictions that decided to retain the original meaning of rape and categorise other serious sexual offences in (...) other names. The article argues that, apart from accounts based on criminal law principles, the two definitional revisions had been carried out in the environments of different legal culture and social values in the Thai legislative bodies. It appears that the 2007 amendment followed a feminist perspective that emphasises the harm of sexual offences to bodily/sexual integrity as a state for individuals to realise their personhood, while the re-categorisation of sexual offences in the 2019 amendment suggests a greater role of the feminist perspective in another camp that views penile-penetration inherently differs from non-penile penetration and implies that the law continues, to a certain extent, regulating sexuality since the 2019 amendment used the reason of “naturalness” of sexual intercourse to distinguish between penile penetration and non-penile penetration. (shrink)