Same sex marriage: 
Think about what marriage is In all cultures (that I know of - I'm pretty sure someone will find some obscure culture that's different), marriage is a union between a man and woman to create the next generation, and live out their lives together. Marriage isn't something to be taken lightly. Of course, in today's liberal world, it's "everthing goes, because it's humanly (physically) possible". Just because it's possible to do something, doesn't make it right. It's also immoral. You can rationalize it away if you want, but you're only turning your head away from the truth.
Same sex adoption:
I wouldn't approve of it. It's taking a child into an immoral lifestyle. Plus, the child's gonna wonder where they came from, and will ask questions why they have two mommies or two daddies.
Legalizing marijuana:
Why? So more people can get high? Even if it's for "medicinal uses", the risks outweigh any benefit.
Euthanasia:
Killing off the old people will only lead to a slippery slopes of killing off babies born with disabilities -- hmm, wait, that's already being done. (abortions)
Stem (cell) research:
As long as it comes from cells of an unborn baby that's killed (harvested) for their cells, then no.
Capital punishment:
No, except for the most severe and extreme of cases.
Legalizing Prostitution:
Ummm... why? Must be a male thing.
Abortion:
Absolutely not! There's other alternatives, like giving up the baby for adoption. There can be support in schools or whatnot when a pregnacy does happen. (It's never "unexpected", because when you choose to have relations with another man, it's bound to happen) Also, abstinence over condoms. Condoms is another nono.
