Recent work in CHI and CSCW has devoted increasing attention to how the design of network hospitality platforms shapes user experiences and relational outcomes. In this article, I interrogate how different risk factors emerge based on the type of exchanges these platforms facilitate. To do so, I juxtapose two prominent network hospitality platforms: one facilitating negotiated exchange (i.e., Airbnb) with another facilitating reciprocal exchange (i.e., Couchsurfing). Homing in on sexual risk, an underexplored form of platform danger, and drawing on interviews with 40 female dual-platform users, I argue that Airbnb's provision of binding negotiated exchange and institutional safeguards reduces risk through three mechanisms: casting initial guest-host relation into a buyer-seller arrangement, stabilizing interactional scripts, and formalizing sexual violence recourse. Conversely, Couchsurfing's focus on reciprocal exchange and lack of safeguards increase sexual precarity for users both on- and off-platform. This study demonstrates how platforms with strong prosocial motivations can jeopardize sociality and concludes with design implications for protecting vulnerable user populations.

翻译：近期CHI与CSCW领域的研究日益关注网络接待平台设计如何影响用户体验及关系结果。本文探究基于平台所促成的交换类型差异，不同风险因素如何产生。为此，我将两个代表性网络接待平台进行对比：一个促进协商型交换（即Airbnb），另一个促进互惠型交换（即Couchsurfing）。聚焦于性风险这一尚未充分探索的平台危险形式，并基于对40名女性双平台用户的访谈，我认为Airbnb提供的有约束力的协商型交换与制度性保障通过三种机制降低风险：将初始主客关系转化为买卖双方关系、稳定互动脚本、以及正式化性暴力求助渠道。相反，Couchsurfing侧重互惠型交换且缺乏保障机制，使用户在平台内外均面临更高的性风险。本研究揭示具有强烈亲社会动机的平台如何危及社交性，并最终提出保护弱势用户群体的设计启示。