Final answer:
Responsible use of contraception is important for preventing pregnancy, and when failure occurs, both partners share the responsibility. Emergency contraceptive methods like the morning-after pill and IUDs can be used to prevent pregnancy after unprotected sex if used within a limited time.
Step-by-step explanation:
When it comes to emergency contraception, it is important to note that the responsibility of a pregnancy is shared by both partners involved in the unprotected intercourse, regardless of whether a contraceptive method was used or not. If a woman fails to take her birth control pill and becomes pregnant, it is the result of a mutual action taken by both individuals. Moreover, emergency contraception, including the morning-after pill and IUDs, can be employed after unprotected sex to prevent pregnancy.
The morning-after pill is effective in preventing ovulation if taken within five days of unprotected intercourse, while the insertion of an IUD can also prevent pregnancy almost entirely if done within the same time frame. Birth control pills require proper and consistent use to be effective, and failure to follow the regulated instructions can result in ovulation and potential pregnancy.