Because It Will Destroy The Traditional Meaning of Marriage:
I think you will find that actual 'traditional marriage' was a woman's father signing over ownership of her to the husband that he has picked out. Thank god we have moved on from such outdated 'traditions', right?
The Bible Says It's Wrong:
The bible doesn't actually say anything about gay marriage. It does however say that you shall not wear clothing of mixed fabrics (Deuteronomy 22:11), guess we're all going straight to hell!
Because Being Gay Is Unnatural:
Homosexuality is found in over 450 species. Homophobia is only found in one- i think it is clear which is more unnatural.
Because Gay Men Are Sexual Predators:
Male rape is most commonly committed by heterosexual men (McMullen 1990). Better keep your back against that wall for the rest of your life!
Because Gay Sex Is Disgusting:
If you have ever jerked off to a little bit of girl on girl action or if you have ever had heteronormative anal sex then your argument is immediately invalid.
Because Gay People Are Icky:
Well.. At least you're honest but i personally find homophobics icky and you're still allowed to get married.
Because Innocent Children Might Re-enact Gay Marriage Scenes At School And It Will Turn Our Kids Gay:
You're really more comfortable with children acting out gun fights than acting out a display of love? Pretending to be gun-touting criminals doesn't turn children into gun-touting criminals. Pretending to be a pony doesn't turn children into ponies. Heck, how many LGBT people re-enacted heteronormative marriages when they were kids? You should really look up the definition of 'pretend'.