Collins and Feeney reviewed a number of studies showing how each attachment style relates to the willingness to self-disclose, the willingness to rely on partners, and the willingness to engage in physical intimacy. The secure attachment style is generally related to more self-disclosure, more reliance on partners, and more physical intimacy than other attachment styles. However, the amount of intimacy in a relationship can vary due to personality variables and situational circumstances, and so each attachment style may function to adapt an individual to the particular context of intimacy in which they live.