There are several places to have fun, depending on what floats your boat (get teh joke? wink wink)
If you're into culture, try the Gulou district. They have Dazhong cinema, Guangrong theatre or Fuzhou big theatre (a must see!)

Jack music bar is also a nice place (i go there all the time when i stop by) or Ivy Café in Gulou, which haz nice atmosphere.

You can even make nice russian friends if you have teh money!

make russian friends by money ??
did you mean russian prostitites??

Prostitute? Why that? I believe you misunderstood greatly! From my experience, Russian like to be flashy, spend a lot of money on alcohol, great food. You can't keep up if you have no currency!

There’s not too much going on in fuzhou for nightlife, honestly, but there are some good bands that do come through here on tour. the venue to look out for these concerts/shows are the straitrock livehouse

During night time in Fuzhou have a lot of fun depend on your interest. I suggest you for massage. There are many type of massage in Fuzhou from local based to foreign based. You can contact me if you like that via email lim_yaumee@aliyun.com

herpes

KTV? 

I'm just guessing here but I would say about 500 KTV dens, 1-2 "nightclubs" with epilepsy inducing strobe lights and neon and lots of private booths with skimpily dressed waitresses, a hundred Mahjong dens, about 50 smoky snooker clubs, 5 cafes that double up as bars/gangster hangouts at night and...no that's it.