"FWB" stands for "Friends with Benefits." It refers to a type of relationship between two friends who engage in sexual activity or physical intimacy without the expectation of a romantic commitment or dating. Typically, it involves ongoing casual sex with the context of friendship rather than a romantic relationship. These relationships are usually characterized by mutual respect and understanding that the arrangement is casual and not intended to evolve into a committed romantic relationship, although sometimes feelings can develop. The primary aspect is that the parties remain friends while also having "benefits" in terms of physical intimacy without the strings of romance.