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Ancestral primacy of same-sex behaviour does not explain its stable prevalence in modern populations

We agree with Monk et al. that same sex behaviour may have been ancestrally prior to different sex behaviour. However, we do not think that this hypothesis obviates standard hypotheses about the ratio of same sex to different sex behaviours in current populations. Nor do we think the new hypothesis is any more parsimonious than previous work. We explore this situation and make comment on the impact of this hypothesis for the field.