<prompt> In the perspective of the busy life schedule in the modern society, the accepted minimum period of sexual cohabitation resulting in no offspring for a couple to be declared infeile is:One yearOne and a half-yearTwo yearsThree year  <response>: 90 of couple who are cohabiting for at least one year with out contraception will have a conception. This is on monthly conception rates of 20 - 25 in normal young couples attempting pregnancy. 