Can you marry your second cousin?
Yes, in most places you can marry your second cousin. However, some people and some cultures are uncomfortable with such a marriage.
All the States in the US allow the marriage of 2nd cousins. A number of states allow the marriage of 1st cousins.
From religious point of view, most religions do not forbid it. Christianity, Judaism and Islam say nothing about the prohibition of first cousins marrying let alone second cousins.
A second cousin is not the same as a "half-cousin." Your second cousin is the grandchild of the brother or sister of one of your grandparents. There is no such relationship as "half cousin" in the English language, although some people have started using the term for the child of a half-sibling. Even first cousins can marry in many places and second cousins can marry in the vast majority of places.
Your question doesn't make sense. Two people can be first cousins, or they can be second cousins, but it is not possible for Alice to be Bob's first cousin, but for Bob to be Alice's second cousin. Laws regarding cousins marrying vary from place to place, but there are many places where second cousins can legally marry, and some places where first cousins can legally marry.
I dont know... Can you? The question is being asked wrong. Come back and ask me correctly. And if you are unsure about how to ask this question correctly, let me lighten you path... May you legally marry your second cousin? In my eyes... this is how to ask a question... Answer: Second cousin marriages are legal everywhere except South Korea.