2. Twins Can Actually Be Conceived by Different Fathers
If a woman has sex with more than one man when she is ovulating what is called Heteropaternal superfecundation may occur. The sperm from two different men can fertilize separate eggs, which result in twins. Sperm can remain alive and active in a woman’s reproductive tract for several days after sex has taken place. Even though it’s possible, this phenomenon rarely occurs in humans. It is, however, quite common in cats and dogs.