1. Being gay is not natural.
2. Gay marriage will encourage people to be gay, in the same way that hanging around tall people will make you tall.
3. Legalizing gay marriage will open the door to all kinds of crazy behavior.
4. Straight marriage has been around a long time and hasn’t changed at all.
5. Straight marriage will be less meaningful if gay marriage were allowed.
6. Straight marriages are valid because they produce children.
7. Obviously gay parents will raise gay children, since straight parents only raise straight children.
8. Gay marriage is not supported by religion. 
9. Children can never succeed without a male and a female role model at home. 
10. Gay marriage will change the foundation of society; we could never adapt to new social norms.

via bligbi