<prompt> The Standard Days Method SDM advices on avoiding unprotected sexual intercourse:From day 3 to 13 of menstrual cycle.From day 8 to 28 of menstrual cycleFrom day 8 to 21 of menstrual cycleFrom day 3 to 19 of menstrual cycle  <response>: Standard days method: It is for the women having their cycle lengths between 26-31 days. Have their feile days between 8 to 19 days of cycle. Hence, SDM advices on avoiding unprotected sexual intercourse during these days of menstrual cycle. 