The song is basically about a group of women's strict "no sex" rule similar to a part of the film's plot where Lilly (played by Beyoncé) does not want to start a sexual relationship with her boyfriend Darrin played by (Cuba Gooding Jr.) right away [REF].
Although Gooding's character, Darrin, was in love with Beyoncé's character, Lilly, the latter did not always feel the same until later on in the film [REF].