We would like you to assess the QUALITY of each of the following argument (discussing Gay Marriage) and determine if the argument is Valid or Invalid. A valid argument is clearly interpretable and either expresses an argument, or a premise or a conclusion that can be used in an argument for the topic of gay marriage. An invalid argument is a phrase that cannot be interpreted as an argument or not on the topic of gay marriage.

If you don't want parents to be judged, the mother and father should have different cars.
Invalid

I think the lack of monogamy problem among gay men stems from the fact that homosexuality has always been hand-in-hand with promiscuity.
Valid

If two people should be allowed to "do their own business" in peace than why not gays?

Valid

