they all look the same to me so i was thinking about it, is there any way to visually tell whether a bass is male or female or a marker or something that will tip you off?

check back a couple pages...there is a post about this

Much easier to tell during the spawn, but not an advocate of forcing milt or eggs out off the bass for ID. I copied this and the link:

As a general rule the vent or scaleless urogenital opening in a male largemouth bass tends to be more circular in appearance while the opening in a female largemouth tends to be more elliptical. Having said this, however, I should hasten to note that few biologists or fisheries managers rely on this method of determining the sex of a fish, because even to the well trained eye it results too often in mis-identification.

it is extremely difficult to distinguish between male and female largemouth bass. The only possible exception is when you catch a particularly large fish. As a general rule, largemouth bass bigger than eight or nine pounds are nearly always females. Source(s): http://www.in-fisherman.com/interactive/...

I don't know of any better a visual way to determine sex, but I have been told that if you stick a coffee straw in the anus and it goes straight up, it's a male, if it goes in to the side, it's female... however I don't advocate probing bass either.  It's a tough one but it IS much easier during the spawn