Are the COMIC Magazines Themed?

Is there a list somewhere I can look at that explains what each COMIC Magazine contains, if there is one, meaning the various Magazines are themed according to a fetish I'd assume.

I'm talking:
COMIC Mujin
COMIC Beast
COMIC Karakuten
COMIC Shigeki
...
etc

Are they just different names for the same thing, I'm asking because COMIC LO is centered around Loli, COMIC MILF is centered around mature women so it makes you assume the others are themed too.
Just wondering where to find the information, if the various COMIC magazines are themed, because I'm just overwhelmed by how many different varieties there are and (other than LO and MILF) I cant figure out which COMIC magazine I'd be interested it. I use them as nice reads to discover more great artists =D

Thank you