 Middle @-@ Eastern couples who have not had children , because of the strong desire and social pressure to establish fertility as soon as possible within marriage , rarely use condoms . 
 Middle @-@ Eastern couples <a href='null_relcl' title='1'><mark>who</mark></a><a href='been_done' title='2'><mark>have</mark></a> not had <a href='negative_concord' title='3'><mark>children</mark></a> , because of the strong desire and social pressure to establish fertility as soon as possible within marriage , rarely use condoms . 
Middle @-@ Eastern couples done not had no children , because of the strong desire and social pressure to establish fertility as soon as possible within marriage , rarely use condoms .