Must have a pregnant female. 

* Eating apples will increase your chances of having boys! (i.e. 3 apples = 3 boys) 
* On the other hand, eating watermelons will increase your chances of having girls! 
  (i.e. 3 watermelons = 3 girls) 

To have increased chances of twins or triplets have one or both parents have the 
lifetime reward of fertility treatment. I heard this from someone else. I had my 
pregnant female eat three watermelons to test it out and it worked! She had 3 triplet
girls.