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“Just a show of hands: who here has sex for pleasure?
” The plenary audience at the 22nd Congress of the World Association for Sexual Health (WAS) are thankfully not a shy bunch – most people raise their hands.
Choosy individuals receive direct benefits from their mates and this results in immediate increased fecundity, or the number of offspring produced.
If the competitive sex displays an ornamental trait that reliably indicates some direct benefit then strong selection will favor mating bias.
Evolutionary change is possible because the qualities that are desired in a mate are more frequently passed on to each generation over time.