Actually, sororities includes almost none* of the women at Davidson. Instead, Davidson has four non-residential Eating Houses which are joined through a non-competitive self-selection process (http://www.davidsonpcc.com/eating-house-self-selection.html).
*a very small percentage are in historically African-American sororities: Alpha Kappa Alpha (http://www.davidsonpcc.com/alpha-kappa-alpha.html) and Delta Sigma Theta (http://www.davidsonpcc.com/delta-sigma-theta.html)