The current maximum level is 150 and it comes with a 500 Stamina bar if I'm not mistaken, or 497. Either way around 500 Stamina.
320 stamina is around level 91, I'm at 86 and have 305.
You gain 3 Stamina per level, as previously mentioned by Drip.

from lvl 100 (or maybe later, i'm not sure) onwards, you get only 1 additional stamina per lvl. so 500 stam with lvl 150 is impossible.
i'm at lvl 121 with 366 stamina.

:O I didn't know that. Someone should add that to our Wiki, doesn't have any mention of anything like that. (Or really any mention of our Stamina/Lvl ratios.)
Thanks for the info Paraphin. I guess that means max Stam at the moment is 395?

maybe, or maybe there is no max. lvl but a max stamina.
i didn't found any valid information about that so we have to try ourselfs^^

Bahaha well you'll probably be there long before me, you're the strongest player on my helper list. lol

there are some player here who are way more experienced and more powerfull than me.
i hope i can add them to my ally-list sometimes, i sort of hunt powerfull allies XD

btw. does anybody know if the ally-list on the title screen will come back?

I'm lvl 135 and I have 380 stam right now.

Here I was thinking this may be about his other - ah-hum - activities, seeing as I just maxed by 100th girl with only 2 dupes...this means he's somehow servicing 98 girls and running a war


That's stamina

^ I believe it's not even a mathematical extrapolation to determine how much you increase stamina at each level. There should be a table somewhere on the interwebs, as someone is always anal about data in games....