All extremely dumb replies. An infinite number of reasons could affect a relationship so one that is highlighted isn't the end all reason. It just happens to affect an important aspect to relationships that goes under the radar because we can't detect it happening with any of our senses. We (humans), like animals and insects, give off pheromones. What they're saying is that the pill messes with your bodies ability to read them properly. End result is incompatible mate.