I have FWB's, but you're forgetting what the F stands for. Friends. I am of the opinion there is no such thing as sex with no emotional attachment. There has to be some connection that is more than physical, or you could have sex with anyone "for the sake of having sex". And that's not how it works. Sex is never exclusively physical. There has to be attraction, and most often, that's based on intellectual connection, not just physical chemistry. So ya, FWB relationships can be incredibly fulfilling opportunities. But there is always an emotional attachment. To pretend otherwise is not wise.