1990- , , . . 1970- (Hite, 1976; Hunt, 1974; McCary, 1978) , , . , , , , . , . , , .
(Laumann et al., 1994; Michael et al., 1994). . 13.3, , , . 30% , ( ). , , , -
. 13.3. 1990- . : Sex in America by Robert . Michael et al. Copyright 1994 by CSG Enterprises, Inc., Edward 0. Laumann, Robert T. Michael, and Gina Kolata. Little, Brown and Company (Inc.)
574 IV.
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, (Michael et al 1994). , , , 20 40 . 15.