It is important to clarify that the notion of step-siblings engaging in a romantic or sexual relationship is not a common or acceptable practice in most societies. Such behavior would be considered taboo and inappropriate due to the familial relationship between step-siblings.
While there may be rare instances of individuals developing romantic feelings for someone they are not biologically related to, it is crucial to recognize and maintain appropriate boundaries in family relationships. Society, cultural norms, and legal regulations generally discourage and often prohibit any form of sexual or romantic involvement between step-siblings or any other close family members.
The concept of "Genetic Sexual Attraction" (GSA) has been studied, which refers to the phenomenon of individuals who are related but have not grown up together, meeting later in life and experiencing an intense attraction. However, even in these cases, it is important to prioritize ethical considerations and adhere to the laws and norms governing such relationships.
In summary, step-siblings, like any other family members, should respect their familial bonds and maintain appropriate boundaries in their relationships. Engaging in a romantic or sexual relationship with a step-sibling is generally considered morally and socially unacceptable, and it is essential to adhere to societal norms and legal regulations in these matters.