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.

Or put in a different light, parents always have the right to raise their children as they please.
Invalid

Remember that gay people, like heterosexuals, can have sex without getting married.
Valid

Because it doesn't work as well, the argument that gays and straights have equal opportunity for marriage is fallacious because it assumes that opposite-sex marriage works equally for everyone.

Valid