Rational choice theory of marriage market predicts that mate selectivity responds to operational sex ratios whereby the sex in shorter supply and thus greater demand becomes more selective. In contrast, an evolutionary psychological perspective on mate selectivity predicts that women on average will be more selective than men under most circumstances, and the sex difference will not respond to operational sex ratios. We analyze mate preferences expressed by men and women (n = 2,956) who subscribe to a computer dating service in Tel Aviv, Israel, which has an extremely low sex ratio (646 available single men for 1,000 women). The findings support the evolutionary psychological prediction and show that women remain more selective than men even under conditions of extreme "marriage squeeze" for women.