21 with a very high sex drive.. Help!!

I don't think it's at all normal if I go by the women I've known intimately. In the beginning it's sex all the time, but once they're secure that they've got you it tapers off to a bit more manageable number (thank god or all us guys would lose our jobs, because, let's face it, we guys would much rather screw than work, right?). Then again there are a few of us, well me anyway, cause I don't discuss this shit with other guys, who would be happier having sex 20 times or more a week. I've never found a gal who'd do that after the first year or so. And when you live on a boat, there's no end to the places you can have sex!
I really wish you the best of luck finding a guy who'll keep up with your desires, and I would sincerely suggest that you don't settle for anything less, unless you want a relationship that doesn't satisfy your physical needs. That way leads to unhappiness or infidelity, both unpleasant and detrimental to a relationship.