Perceptive Kokko + Jennions commentary https://dx.plos.org/10.1371/journal.pbio.3001955 on Fromonteil et al https://dx.plos.org/10.1371/journal.pbio.3001916 on #SexualSelection in ♀️. I work with animals where ♀️mate multiply but produce 1 young. Glad to see paper points out #BatemanGradient SHOULD be measured from matings but in the wild it is often measured from paternity assignments. Other obvious problem: probability to detect #MultiplePaternity increases with litter size, so inevitably multiple paternity correlates with♀️reproductive success