What They Study: All the lifeforms coexisting in all the vast oceans of the world.
Why We Want To Date Them: This is a pretty active branch of biology, so as a general rule marine biologists tend to be fairly hunky with a nice tan. Many of them know how to scuba dive. And their love for whales is so sweet.
Potential Downfalls: They are often out to sea for extended periods of time. Looming danger of jellyfish stings.